APFIVE Which of the following is the best example of an endotherm, an organism that generates substantial internal heat to maintain a stable body temperature regardless of environmental conditions?
An animal that primarily relies on external heat sources to regulate its body temperature, typical of ectothermic organisms.
An animal with a metabolic rate of $$10$$ Joules per minute that shows significant temperature fluctuations with the environment, a hallmark of ectothermy.
An animal generating $$50$$ Joules per minute internally while maintaining a constant body temperature of $$37$$°C, which exemplifies endothermy.
An animal that produces $$50$$ Joules per minute internally but still experiences large fluctuations in body temperature, contradicting endothermic regulation.
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