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Darwin's Theory Of Natural Selection

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Natural Selection is the scientific theory first proposed by English Naturalist, Charles Darwin as an explanation for evolution. Darwin first became aware of the capability of this theory when he studied variation in plants and animals during a five-year voyage around the world in the 19th century. He noticed whilst in the Galapagos Islands that the habitat of certain finches on the island changed their physical characteristics. Darwin mainly focused on the shape of the finches beak according to their habitat, concluding that even though the finch had a common ancestor, their beak shaped evolved according the foods that they ate in their habitat. He continued the development of this theory by studying hundreds more plants and animals than on …show more content…
Variation: This is showing the beetles from the same population, however, this population includes the variation of colour. Heredity: This is showing that has the green and brown beetles reproduce, the variation that is evident in the population, those with both green parents are green, those with brown are brown, and those with a green and a brown parent can be either. According to their surroundings, the brown are more advantageous against predators. Differential Reproduction: As the brown are more advantageous, their numbers will remain stable, whereas the green will drop in numbers as they cannot camouflage from predators. Consequently, the brown will continue in numbers as they will be dominant for reproduction, where as the green will decrease in numbers, and may in die out altogether.

Different organisms that have similar basic structures, but can be used for different purposes are evidence for a common ancestor. These are called homologous structures. An example is the pentadactyl limb, which is the basic structure found in amphibians, reptiles, birds and mammals. The basic structure is formed …show more content…
For example insects and birds both have wings used for flying, however did nit evolve from a common ancestor.

Comparative Embryology
Embryos in the early stages of development and of different species (particularly vertebrates) can show similarities, which can indicate a common ancestor. For example, all vertebrate embryos develop with gill arches, notochords, spinal cords and primitive kidneys, as well as the same skin that develops into the organism’s body covering (such as feathers and scales).

Biogeography
The distributions of species into different biogeographic regions were studied by Charles Darwin and Alfred Russell Wallace. Both saw this as major evidence to support the theory of evolution, as that organisms from different regions of the world had come from a common ancestors and adapted to conditions of a particular region. This concludes why organisms were close in regions come from common ancestors, whereas isolated regions (for example, Australia) has unique

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