Which of the following statements comparing endotherms and ectotherms is correct?
A) Mitochondrial density and enzyme activity are 3-4 times higher in the cells of ectotherms than in the cells of endotherms of similar size.
B) Endotherms can use more of their energy intake for reproduction than ectotherms can.
C) Endotherms and ectotherms have about the same mass-specific metabolic rate.
D) Both endotherms and ectotherms exchange heat with the environment through convection, conduction, radiation, and evaporation.
Answer: D
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