Endothermy is the capability of an organism (to most cases, mammals) to generate and conserve heat to maintain a stable body temperature. Fat stores play a big role in endothermy for fats are metabolized by the organisms to maintain their internal temperature through heat production.
Mammals (and to an extent birds) have extensive fat stores within their bodies. Define endothermy, and explain the relevance of these fat stores to the maintenance of endothermy. Also discuss the importance of hair and feathers for endothermy.
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