Organisms that depend largely on external sources of heat to maintain body temperature are called
A) homeothermic.
B) endothermic.
C) heterothermic.
D) ectothermic.
E) mesothermic.

Question

Quizplus · Accepted Answer

Organisms that depend largely on external sources of heat to maintain body temperature are called ectothermic. Ectothermic animals cannot regulate their body temperature internally like endothermic animals do, and instead rely on behavioral adaptations such as basking in the sun or seeking shade. Examples of ectothermic animals include reptiles, amphibians, and most fish.

Organisms That Depend Largely on External Sources of Heat to Maintain