Question

Which of the following statements is true?

A.Only ectotherms are affected by temperature
B.Endothermic organisms obtain their heat from the environment
C.Organisms can experience sub-lethal stress outside the range of optimal temperatures
D.Ectotherms harness heat from their metabolism

Answer 1

Endothermic organisms obtain their heat frominternal sources and are able to maintain a constant body temperature in the face of differing environmental temperatures. Ectotherms, however, rely on external temperatures to set their body temperature.

Step-by-step explanation:

Endothermic organisms obtain their heat from internal sources and are able to maintain a constant body temperature in the face of differing environmental temperatures. They generate internal heat that keeps their cellular processes operating optimally even when the environment is cold.

On the other hand, ectotherms, like reptiles and amphibians, rely on external temperatures to set their body temperature. Their body temperature varies with the environment.

Therefore, option B - Endothermic organisms obtain their heat from the environment - is incorrect.