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Animal Diversity

Time Requirements: Exercise 1: 15 mins.
Exercise 2: 15 mins.
Exercise 3: 30 mins.
Exercise 4: 10 mins.
Exercise 5: 15 mins.
Exercise 6: 20 mins.
Exercise 7: 30 mins.
Exercise 8: 10 mins.
Exercise 9: 30 mins.

Materials Required:
ITEM NUMBER (per group) LOCATION
Any living or preserved plant *specimens (listed below) Display Cart/Counter
Microscopes (compound and dissecting) Display Counter
Colored pencils 1 set Cart/Counter

*Specimens:
Preserved or Living Prepared Slides
Grantia Grantia choanocytes
Hydra
Planaria
Tapeworm
Clam
Termite
Brittle star
Crayfish
Earthworm
Frog
Mammal skulls
Sand dollar
Sea cucmber
Sea star

Lab Safety:
Wear safety goggles/glasses and gloves while handing specimens (it is preferred that specimens remain in the appropriate containers untouched).
Lab coats or aprons may be available upon request.

Demonstrations/Tutorials:
To display each life cycle with specimens and slides, see the following display suggestions –

Clean up and Disposal of Waste
1. Return any materials to original locations.
2. Try to preserve any living specimens for future labs.

Lab Alternatives – Computer Based p. 113 Exercise 1 – Phylum Porifera – Sponges
Given that all sponges are filter feeders, why does it follow that all sponges are aquatic?
Filter feeding is the filtering of nutrients and plankton suspended in water therefore for sponges to feed effectively they must be aquatic

Would mobility improve the ability of sponges to capture food? Explain.

Mobility would improve the action of the sponge, help it to capture food because it has a hard thing trying to find it non mobility

Exercise 2 – Phylum Cnidaria – Jellyfish, Sea Anemones, Corals

1 how do jellyfish us there stingers?
The tentacles are covered with sacs filled with poison(venom)

What type of sensory information enables the hydra to locate its prey?

The hydra remains attached to their substrate and let their tentacles drift with the water currents. If a prey item brushes into one of the tentacles, the hydra quickly grabs onto it with the other tentacles subduing it with poisonous threads/filaments from its nematocysts.

3. Get a brine shrimp or Daphnia (water flea) and put it in the dish with the hydra. Describe the hydra’s feeding response.

Why is this type of digestive system inefficient?

Why is radial symmetry adaptive for a sessile animal in an aquatic habitat

As it grows from a stem and can't move it spreads as it grows. Sessile and free-floating animals such as echinoderms and cnidarians exhibit two distinct advantages of radial symmetry. Primarily, radial symmetry allows for animals to reach out in all directions from one center such as during feeding. This is an advantage since they don't have a high degree of controllable movement even during food collecting periods.

Exercise 3 – Phylum Platyhelminthes – Flatworms
Free-living Flatworms
2. What does the planarian do?

A carnivorous flatworm with a three branched digestive cavity, that eats living or dead invertebrates

4. Describe its behavior.

Because it is where the nutrients is absorbed and where food is digested

What can you conclude about the sensory capabilities of the planarian?

After observing the planarian’s behavior, why is bilateral symmetry more adaptive than radial symmetry for a motile animal? (Hint: How is the body form of the planarian different from that of the hydra?)

Parasitic Flatworms
Observe the preserved tapeworm specimen on display. Sketch it in the margin of your lab manual and describe it below.

Reproduction can be an extremely complex matter for the internal parasites. Why is this so? (Hint: What’s the first requirement for sexual reproduction?)

How can a tapeworm, for example, survive without a digestive? (Hint: What is the purpose of digestion?)

Exercise 4 – Phylum Nematoda – Roundworms
Observe the nematodes on display and note the characteristics they share.

What is the advantage of a two-opening digestive tract?

Exercise 5 – Phylum Annelida – Segmented Worms
Would you expect the gizzard to be muscular or nonmuscular? Why?

What is the advantage of having food broken up into smaller pieces?

Why is the intestine the longest organ in the digestive system?

How does specialization of organs in the digestive system increase the efficiency of digestion?

Exercise 6 – Phylum Mollusca – Mollusks
Compare the clam’s digestive system to that of the earthworm. Why do earthworms have two organs that clams don’t have?

Exercise 7 – Phylum Arthropoda
Thinking about various crustaceans you have encountered, how do you suppose this class got the name Crustacea?

2. Sketch the crayfish in the space below. 3. Describe the exoskeleton of the crayfish.

4. Describe the jointed appendages of the crayfish.

You are about to examine an insect that causes a lot of damage, so to balance our coverage, can you name some insects that are beneficial to humans?

5. Why should you use a NaCl solution instead of water?

9. Sketch some of the protozoans you use.

Why is radial symmetry adaptive for the echinoderms?

Exercise 9 – Phylum Chordata
Does the frog use these teeth for chewing?
No its use for helping to catch pray

Why is this important?
Because it’s not what we use are teeth for and normally when you have an animal with teeth they us it to tear the pray apart

Why is structural support more important for a land-dwelling organism than it is an aquatic one?

Explain the similarities and differences among the animals in terms of their diets.

Which came first, the chicken or the egg?
I think the egg came first, I also think chickens derived from a mixture of different animals and the an egg was formed. And through evolution came the chicken we know today.

What might be the reason for this difference? (Hint: Consider the composition of the diets. Do you get more calories from a salad or a hamburger?

View the skulls or photographs on display. For each specimen, describe the teeth and state your inferences about the animal’s diet?

Questions for Review
1. Examine the “unknown” animals on display. Describe which phylum each animal belongs to and explain what characteristics you used to make your decision.

2. Why are sponges named pore bearers?
They are covered with millions of tiny holes or pores

3. Bivalves have little sensory ability and heavy shells, while cephalopods have well-developed senses and reduced shells. How are these characteristics adaptive for each group?

4. Compare the echinoderms with cnidarians. Consider the habitat, symmetry, locomotion, defense, and means of obtaining food.

5. Name the three phyla that contain animals called worms. Discuss the differences among the digestive tracts of these three phyla.

6. Concentrating on the evolutionary transition from amphibians to reptiles, discuss the adaptations that allow vertebrates to be successful in terrestrial habitats.

7. Using an examples at least tow bilaterally symmetrical organisms and two radially symmetrical organisms, discuss the adaptive value of bilateral versus radial symmetry.

8. Choose three animals from different phyla and describe their adaptations for obtaining food. Explain how these adaptations are suited to each animal’s environment.

9. Choose three animals from different phyla and compare their means of digesting food. Include in your answer a comparison of the efficiency of each digestive system.
Exercise A: Phylum Porifera
A. Phylum Porifera: The Phylum Porifera ("pore-bearing") contains approximate 5,000 species of sponges. These asymmetrical animals have sac-like bodies that lack tissues, and are usually interpreted as representing the cellular level of evolution. Cells from fragmented sponges can reorganize/regenerate the sponge organism, something not possible with animals that have tissues. Most zoologists consider sponges as offshoots that represent an evolutionary dead-end. Sponges are aquatic, largely marine animals, with a great diversity in size, shape, and color.

Modern sponges greatly resemble some fossil Cambrian sponges. Sponges may have evolved from a colonial protozoan. There are no true tissues in sponges: merely specialized cell layers. Epidermal cells in sponges line the outer surface. Collar cells line the inner cavity. Beating collar cells produce water currents that flow through pores in sponge wall into a central cavity and out through an osculum, the upper opening. A 10 cm tall sponge will filter as much as 100 liters of water a day. Amoeboid cells occupy the "inner" layer, along with hardened structures known as spicules.

Sponges feed by drawing water into the body through a network of pores (hence the name porifera, pore-bearer) and passing it out through the large opening (osculum) at one end of the body.
(Text ©1992, 1994, 1997, 1998, 1999, 2000, 2001, 2002, M.J. Farabee, all rights reserved – Online Biology Textbook)

Procedure:
• Get a specimen of Grantia observe it.
• Observe the specimen under the dissecting microscope, note the spicules.
• Use a compound light microscope to examine a prepared slide of Grantia. This thin cross section has been stained so you can see the collar cells (choanocytes) protruding into the canal. Grantia cross-section
• Observe the filter-feeding of a sponge when a dye tracer is used. Note how much water is moved through the sponge!

1. Given that all sponges are filter feeders, why does it follow that all sponges are aquatic?

2. Would mobility improve the ability of sponges to capture food? Why or why not.

3. Name the cells that carry out movement of water; trapping food particles; digestion; provide support and protection.

Exercise B: Phylum Cnidaria
The Phylum Cnidaria contains 10,000 species characterized by adult bodies having radial symmetry. Cnidarians are aquatic, mostly all marine. Cnidarians have only the ectoderm and endoderm tissue layers. Members of this phylum are characterized by stinging cells, that eject a barbed thread and possibly a toxin. Only cnidaria have cnidocytes, a specialized cell that contains a nematocyst, a fluid-filled capsule containing a long, spirally coiled hollow thread. When the trigger of the cnidocyte is touched, the nematocyst is discharged. Some threads merely trap a prey or predator, while others have spines that penetrate and inject paralyzing toxins.

Cnidocyte/nematocyst in a cnidarian. These stinging cells allow the animal to capture small prey, as well as offer some defense if attacked.

Two body forms occur: a mobile medusa and a sessile (not mobile) polyp. Both forms have tentacles arranged around an opening into the two-layered sac-like body. The inner tissue layer (derived from endoderm) secretes digestive juices into the gastrovascular cavity, which digests food and circulates nutrients. Muscle fibers occur at the base of the epidermal and gastrodermal cells. Nerve cells located below epidermis near the mesoglea interconnect and form a nerve net throughout the body. Cnidarians have both muscle fibers and nerve fibers, making these animals capable of directional movement. The nerve net allows transmission of messages in more than one direction, possibly an advantage in a radially symmetrical animal, while contraction of muscle fibers (under control of the nerve fibers) allows for movement.

Cells are organized into tissues. The adult in most species is radially symmetrical. The typical cnidarian life cycle involves both sexual and asexual reproduction. A bilaterally symmetrical larva known as a planula, develops from a zygote. The planula settles in an appropriate location and grown into the adult polyp, that reproduces asexually to form medusae. Each medusa develops gonads and forms gametes.
(Text ©1992, 1994, 1997, 1998, 1999, 2000, 2001, 2002, M.J. Farabee, all rights reserved – Online Biology Textbook)

Find a labeled photograph of a hydra under a dissection scope and paste into the box (hint: use google images for your search) 

4. View the hydra movie. Describe what happens when the brine shrimp touches the tentacle of the hydra. This simulates the piece of thread.

5. (this is different from book) Look at a prepared slide of Hydra. Hydra Slide I, Hydra Slide II
a. Note the central cavity which is the gastrovascular cavity. Digestion beings here by cells lining the cavity quickly take up food particles and intracellular digestion occurs.
b. Tissue layers of hydra (cnidarian): Note the ectodermis and gastrodermis.

6. a. View the feeding hydra movie. Describe the feeding hydra response.

b. Why is this type of digestive system inefficient?

7. Why is radial symmetry adaptive for a sessile animal in an aquatic habitat?

8. What type of “skeleton” keeps the hydra upright?

Exercise 3: Phylum Platyhelminths – Flatworms
The Phylum Platyhelminthes contains about 13,000 species of flatworms subdivided into three classes: two parasitic and one free-living. The and relatives are freshwater animals placed in the Class Turbellaria. Flukes are external or internal parasites belonging to the the Class Trematoda. Tapeworms are internal parasites and form the Class Cestoda. The phylum as a whole has adult bilateral symmetry and cephalization (the development of a head with sensory organs, in most members).

Flatworms have three tissue layers: ectoderm, mesoderm and endoderm and a body plan that is acoelomate and sac-like with a single opening. The mesoderm layer gives rise to muscles and reproductive organs. Free living forms have muscles, a nerve cord, and digestive organs, but lack both the respiratory and circulatory systems common to the "higher" animals. Flatworms have a branched gastrovascular cavity that is the site of extracellular digestion and which distributes nutrients throughout the body. Gas exchange occurs by diffusion through the skin. Platyhelminths have an excretory system that also functions as an osmotic-regulating system. Flatworms have ladder-style nervous system composed of paired ganglia that form a brain connected via nerve cells to sensory cells in the body wall.

Anatomy of a flatworm. Note the sensory lobes and digestive system.

Parasitic members of this phylum, such as flukes and tapeworms, have characteristic modifications:

1. Loss of cephalization producing a head bearing hooks and suckers to attach to the host
2. Extensive development of the reproductive system with loss of other systems (what do they do but reproduce?)
3. Lack of a well-developed nervous and gastrovascular system (the live in a fairly stable environment and the host has already digested their food)
4. Development of a tegument that protects them from host digestive juices

Both flukes and tapeworms use secondary or intermediate hosts to transport the species from primary host to primary host. The primary host is infected with the sexually mature adult while the secondary host contains the larval stage(s).
(Text ©1992, 1994, 1997, 1998, 1999, 2000, 2001, 2002, M.J. Farabee, all rights reserved – Online Biology Textbook

1. Watch the movies of the hydra. Planaria Movie – you need to click on the play button after clicking on a movie to watch. Find a picture and paste it in the box 

2. Since we cannot use a light source, please describe the movement of the planarian.

3. skip

Exercise 4: Phylum Nematoda - Roundworm

The Phylum Nematoda consists of several hundred thousand species of roundworms. Most are free-living, although some are parasitic (pinworms are thought to infect 30% of all US children). Adult nematodes have a pseudocoelom (tube-within-a-tube), a closed fluid-filled space that acts as a hydrostatic skeleton, aids in circulation and dispersal of nutrients. Nematodes lack a circulatory system, but do have a well developed digestive system.

Anatomy of a nematode. Nematodes, like rotifers, are pseudocolelomates.

Ascaris is a parasitic roundworm. These worms are unsegmented and have a smooth outside wall. They move by whiplike motions. Mating produces eggs that mature in the soil, limiting most are to warmer climates. When eggs are swallowed, larvae burrow through the intestinal wall, moving to the liver, heart and/or lungs. Once within the lungs, larvae molt and, after 10 days, migrate up the windpipe to throat where they are swallowed. In the intestine, the mature worms mate and the female deposits eggs that are lost with the feces. Feces must reach the mouth of the next host to complete the life cycle, thus, proper sanitation is an important aspect to prevent infection.

Humans contract Trichinella (which causes the disease trichinosis) by eating raw pork containing encysted larvae. Mature female adults burrow into the wall of the small intestine. Live offspring are carried by the bloodstream to the skeletal muscles where they encyst. Religious dietary injunctions against eating pork may in part be a reflection of the prevalence of this disease in the Middle East.

Elephantiasis, a disease associated with tropical Africa, and is also caused by a filarial worm that utilizes mosquitos as secondary hosts. Adult worms reside in and block lymphatic vessels. This results in limbs of an infected individual swelling to monstrous size. Elephantiasis is treatable in its early stages but not after scar tissue has blocked lymphatic vessels. (Text ©1992, 1994, 1997, 1998, 1999, 2000, 2001, 2002, M.J. Farabee, all rights reserved – Online Biology Textbook)

Procedure: • Study the nematode specimens available. Nematode images. Click on the various images to enlarge.
• Study the dissected nematode. Dissected nematode. Look at picture of Ascaris (nematode) and run cursor overtop of word to highlight that area on the diagram.

What is the advantage of a two-opening digestive tract?

Exercise 5: Phylum Annelida – Segmented Worms
The phylum Annelida contains segmented worms (such a the earthworm). The development of segmented bodies allowed the formation of specialized functions in different segments. Annelids have an enlarged coelom to accommodate more complex internal organs. The well-developed, fluid-filled coelom and the tough integument act as a hydrostatic skeleton. There are about 12,000 marine, freshwater, and terrestrial species usually divided into three taxonomic classes. Similarities of larval forms to Mollusks suggest annelids share an common ancestral group.

Annelids have a closed circulatory system with blood vessels running the length of the body and branching into every segment. Closed circulatory systems are more efficient than open ones for moving materials within a body. The annelid nervous system consists of a brain connected to a ventral solid nerve cord, with a ganglion in each segment. Annelids have a complete digestive system that include a pharynx, stomach, intestine, and accessory glands. Excretory nephridia in each segment collect waste material from coelom and excrete it through the body wall. (Text ©1992, 1994, 1997, 1998, 1999, 2000, 2001, 2002, M.J. Farabee, all rights reserved – Online Biology Textbook)

Procedure: • Examine a digested earthworm (Lumbricus): Dissection Note the brain, ventral nerve chord, blood vessels. Identify the pharynx, esophagus, crop, gizzard, and intestine
• Examine the cross-section of an earthworm. Cross section o Locate the thin cuticle lying on the outside of the worm. It is secreted by the epidermis. o Note the true coelom or eucoelomic body cavity.
• Using www.google.com image tab, examine the setae of both polychaete and oligochaete. Note the differences between these two groups.

1. Would you expect the gizzard to be muscular or nonmuscular? Why (relate to function)?

2. What is the advantage of having food broken up into smaller pieces before digesting it?

3. Why is the intestine the longest organ in the digestive system?

4. How does specialization of organs in the digestive system increase the efficiency of digestion?

Exercise 6: Phylum Mollusca:
The phylum Mollusca contains over 100,000 species with a variety of body forms and lifestyles. In mollusks, the coelom is reduced and limited to the region around the heart.
The Mollusk body first appeared during the Cambrian Period. All mollusks have:
1. A visceral mass containing internal organs, including the digestive tract, paired kidneys, and reproductive organs.
2. A mantle that surrounds but does not cover entirely the visceral mass and secretes a shell (if one is present). The mantle also contributes to formation of gills or lungs.
3. A head/foot region containing sensory organs and a muscular structure (foot) used for locomotion. The foot is a muscular structure used for locomotion, attachment to a substrate, food capture, or a combination of functions. A radula is an organ that bears many rows of teeth and is used for grazing on food. The nervous system consists of several ganglia connected by nerve cords. Most mollusks have an open circulatory system: a heart that pumps hemolymph through vessels into a hemocoel. Blood diffuses back into the heart and is pumped out to the body again. Some mollusks are slow moving, and have with no head, while others are active predators that have a head and sense organs.
(Text ©1992, 1994, 1997, 1998, 1999, 2000, 2001, 2002, M.J. Farabee, all rights reserved – Online Biology Textbook)

Procedure
• Study the molluca specimens available: Chitons, African snails, clam, squid
• Observe the dissected clam. Shell (bi-valve), lateral view, and posterior view.
a. Identify the shells
b. Identify the foot, gills, mantle, adductor muscle.

1. Name two ways that clams can move.
Clams have the most control of their movement using their foot or by using water currents, which allows them to move from one region to the other

Read more : http://www.ehow.com/how-does_4744976_a-clam-move.html

Read more : http://www.ehow.com/how-does_4744976_a-clam-move.html
Exercise 7: Phylum Arthropoda
The phylum Arthropoda contains animals with segmented appendages on their body segments. Arthropods occupy every habitat, and are in many respects the most successful animal group on Earth. There are conservatively over 1 million species of living arthropods. Biologist E.O. Wilson estimates there are 10 million species, 9 million of which are arthropods. Certain groups of arthropds have extremely complete fossil records.
Arthropod features that have contributed to their success include:
1. A hard exoskeleton, a strong but flexible outer covering composed primarily of the carbohydrate chitin. This functions in protection, attachment for muscles, locomotion, and prevention of desiccation.
2. Presence of jointed appendages. Trilobites, which flourished during Cambrian Period and were important animals in marine ecosystems for the remainder of the Paleozoic Era, had a pair of appendages on each body segment. Modern arthropod appendages are specialized for walking, swimming, reproduction, etc. These modifications account for much of the diversity and success of arthropods.
3. A complex nervous system with a brain connected to a ventral solid nerve cord. The head bears various sensory organs. Compound eyes have many complete visual units, each of which collects light independently. The lens of each visual unit focuses the image on light sensitive membranes of a small number of photoreceptors within that unit. In simple eyes (like our own), a single lens brings the image to focus into many receptors, each of which receives only a portion of the image.
4. A unique respiratory system that employs a variety of respiratory organs. Marine arthropods utilize gills composed of a vascularized, thin-walled tissue specialized for gas exchange. Terrestrial forms have book lungs (e.g., spiders) or tracheae. (e.g., insects). Book lungs are invaginations to serve in gas exchange between air and blood. Tracheae are air tubes that serve as ways to deliver oxygen directly to cells.
5. A complex, yet adaptable, life cycle. Metamorphosis is a drastic change in form and physiology that occurs as an immature stage becomes an adult. Metamorphosis contributes to the success of arthropods because the larval stage eats food and lives in environments different from the adult; reducing competition between immature and adults of a species. Reduction in competition thus allows more members of the species to exist at one time.
The arthropod body consists of three major collections or zones of body segments:
1. head
2. thorax
3. abdomen
(Text ©1992, 1994, 1997, 1998, 1999, 2000, 2001, 2002, M.J. Farabee, all rights reserved – Online Biology Textbook)

Procedure: Examine a crawfish

1. Paste a picture of a crayfish below

2. Describe the exoskeleton of the crayfish.

3. Describe the joined appendages of the crayfish

4. Human have many unpleasant interactions with insects, including those that sting, bite, suck our blood, and transmit disease. Please name so insects that are beneficial to human and what benefit(s) they provide.

Exercise 8: Phylum Echonodermata
There are 6000 species of echinoderms; all extant species are marine. The phylum Echinodermata includes the sea urchins, sea stars, sea cucumbers, and starfish. Most adults have radial symmetry, while their larvae are bilaterally symmetrical. Echinoderms have an endoskeleton consisting of calcareous plates bearing spines. Radial symmetry appears to be an advantage to the mostly bottom-dwelling echinoderms, who can thus feed in every direction. Adult echinoderms have no brain. Members of the phylum have a water vascular system that powers their multitude of tube feet. Anatomy of an adult sea star. Lower (right) image is a cross section through an arm of the adult sea star. Images from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com), used with permission.
(Text ©1992, 1994, 1997, 1998, 1999, 2000, 2001, 2002, M.J. Farabee, all rights reserved – Online Biology Textbook)

Procedure:

1. Paste a picture of a sea star in the box provided on your answer sheet. 2. Why is radial symmetry adaptive for the echinoderms?

Exercise 9: Phylum Chordata
The phylum Chordata includes a few invertebrates (animals without backbones) as well as the vertebrates. All share the common chordate characteristics: a hollow nerve cord that runs along the animal's back, a notochord, gill structures, and a post-anal tail.
One group of invertebrate chordates is the tunicates. Tunicates are marine animals commonly called sea squirts. Most of the adults are stationary suspension feeders. They are commonly found on docks, boats, and rocks, though some live in the open ocean. A group of tunicates is shown in Color Plate 6.
The largest group of chordates by far is the vertebrates, which are distinguished from invertebrates by the presence of a backbone. Although vertebrates make up only about 3% of all animals, they are probably the most familiar animals: fishes, amphibians, reptiles, birds, and mammals.
Fish are the most diverse group of vertebrates, including more than 30,000 species. The earliest fish had no jaws and survived as scavengers or parasites. The evolution of jaws brought unprecedented opportunities for exploiting food sources. The majority of fish are carnivorous. They seize and hold their prey with their teeth and then swallow it whole. Some have teeth in their throats to help grind the food. Herbivorous fish feed on aquatic plants such as grasses and other flowering plants and algae. Some fish eat both plants and animals, some are parasites, and some feed on organic debris. A large number of fish are suspension feeders. Many of them live in schools in the open sea, straining small floating plants and animals from the water.
Amphibians include approximately 4,800 species of newts, salamanders, toads, and frogs. As the name (Greek amphi, double; Greek bios, life) implies, amphibians lead a double life in terrestrial and aquatic habitats. Although important adaptations for terrestrial life have appeared, such as lungs and limbs, amphibians still require water-or at least moisture-for reproduction, and their larvae have an aquatic tadpole stage.
Most adult amphibians are carnivorous, feeding on invertebrates such as snails, worms, insects, and any other moving animal that is small enough to swallow. Frogs and toads have a tongue attached in the front of the mouth. When prey is spotted, the tongue is quickly launched and the prey is caught on the sticky end. The mouth has small teeth to hold the prey, which is then swallowed whole.
We will use the frog to illustrate the further specialization of the digestive tract in vertebrates. All vertebrates share similarities in their body plans, including in their internal organs, so the frog's digestive tract is very similar to our own.
(From: Laboratory Investigations forBiology.2nd ed. Jean Dickey. Copyright@2003 by Pearson Education, Inc.)
Procedure:
• View the frog, note the attachment of the tongue.
• View frog’s digestive tract.

1. The inner surface of the small intestine is very wrinkled, resulting in a large amount of surface area. Why is this important (relate to function)?

2. Why is structural support (i.e. bony skeleton) more important of a land-dwelling organism than it is for an aquatic one?

3. Which came first, the chicken or the egg?

4. What might be the reason that carnivores spend less time eating compared to herbivores?
Using the following website: http://www.pbs.org/kcet/shapeoflife/ and internet searches to complete the following table.
Animal Phylum Symmetry Tissue Organization
( i.e. loose aggregate of cells, two layers, three layers) Body Cavity
(none, acoelmate, psudocoelomate, ceolomate) Segmentation
(no, yes, yes in muscles ) Habitat
(i.e. freshwater, terrestrial, marine) Locomotion
(i.e. crawling, wings, fins for swimming, legs for walking etc.)

Sponge

Hydra

Planarian

Roundworm

Earthworm

Clam

Crayfish

Animal Phylum Symmetry Tissue Organization
( i.e. loose aggregate of cells, two layers, three layers) Body Cavity
(none, acoelmate, psudocoelomate, ceolomate) Segmentation
(no, yes, yes in muscles ) Habitat
(i.e. freshwater, terrestrial, marine) Locomotion
(i.e. crawling, wings, fins for swimming, legs for walking etc.)

Grasshopper

Lancet

Frog

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...Do Animals Have the same Rights as Humans? Today millions of Americans and others around the world have pets. Whether it is a dog or cat, fish or bird, hamster or a mountain lion, owners love their pets. To many they are loved as one of the family and considered to possess the loving and functional qualities of a human. Unfortunately, any way these people like to view their animals, does not change the fact that they are still in fact animals. Animals do not possess the cognitive reasoning humans do. They will respond to a stimulus which can be used through classical conditioning to produce a desired result but the training of something does not give it value. Apart from the capacity of animals, there is something else that separates humans from them. If you believe in a soul or spirit that lasts more than this physical life then that is the main difference between animals and humans. I believe God made Man in His image and was given rule over the earth. This however does not mean that animals are to be treated without respect. Humans have a responsibility, being the dominant species on the earth, to care for the rest of our resources. For example, animals can be used to test psychological tendencies and effects of certain drugs or health issues. It would be much wiser to let the death of a rat help produce a way to save the lives of many humans. However, cruelty and inhumane ways of treating animals, usually for no reason, is a careless treatment of the gifts we are given...

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...A Voice for the Animals It should be against the law to have a license or even to buy an exotic animal to have as a pet. Having exotic animals as pets is an inherent risk to human health and safety. Owning these animals is also a risk for them they need to be able to roam free not caged up like a prisoner. They may seem cute and cuddly but they have a lot of responsibilities, they can turn on you, and expensive to have. Some owners have these animals and neglect them and that’s just an un humane thing to do. When people get these animals they don’t think about their health. Some of these animals carry diseases and people don’t know it till they have it. Experts have studied that at least one in three reptiles’ harbors salmonella and shigella. Salmonella is a bacterium that can kill you it is found in animal feces and contaminated food. People who have animals such as: Reptiles, baby chicks and ducklings, and small rodents such as hamsters are particularly likely to carry Salmonella. Shigella is also a bacterium that can infect the digestive tract and cause a wide range of symptoms. When someone has a monkey and chimpanzee, they can get this virus because it’s contagious. These animals should be in there natural environment instead of someone’s home or backyard. The animals are used to roaming around freely for hour’s even days depending on the animal and type. For example tigers travel about 6-12 miles a day and they hunt at night how can you take their routine...

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