... C. ectotherms. D. peritherms. Question 4 In general, reptiles are considered to be a/an: A. poikilotherm. B. homeotherm. C. endotherm. D. heterotherm. Question 5 Mammalian and avian aquatic endotherms use all of the following mechanisms to thermoregulate EXCEPT: A. fat. B. internal respiratory systems. C. fur or feathers. D. concurrent heat exchange. Question 6 The water availability for organisms is determined by: A. internal dissolved ion concentrations. B. external dissolved ion concentrations. C. movement of water down its concentration gradient. D. movement of water up its concentration gradient. Question 7 Aquatic organisms whose ionic concentration of their body fluids exceed that of their surroundings are: A. hyperosmotic. B. hypoosmotic. C. isoosmotic. D. osmotic. Question 8 In order to survive in the desert, a camel will employ which of the following mechanisms? A. Face away from sun B. Store water in its...
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