The Key Difference Between Ectotherms (Such as Lizards)and Endotherms (Birds

question 24

Multiple Choice

The key difference between ectotherms (such as lizards) and endotherms (birds and mammals) is that

• A) ectotherms get the energy they need for thermoregulation from the environment while endotherms generate heat metabolically from within their own bodies.
• B) ectotherms can't regulate their body temperatures at all while endotherms can.
• C) ectotherms get the energy they need for thermoregulation from their own metabolism while endotherms must rely on sunlight.
• D) endotherms can't regulate their body temperatures at all while ectotherms can.
• E) ectotherms have brown fat and endotherms do not.

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