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lethal critical temperatures. They may also inhabit environments with constant temperatures, thus keeping their body temperature constant. Examples include tropical or deep-sea fishes.

Evolution

Origin of homeothermy

The evolution of homeothermy is a complex topic with various hypotheses proposed to explain its origin. Here are the most common hypotheses:

# Metabolic Efficiency Hypothesis: This hypothesis suggests that homeothermy evolved as a result of increased metabolic efficiency. Maintaining

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