The biological condition or characteristic of being endothermic; the capacity of an organism to generate and regulate its own internal body heat.
From 'endotherm' plus the noun suffix '-ism' (indicating a state, condition, or system), used in biology to denote the complete system of internal heat generation that defines certain animal classes.
The evolution of endothermism was a game-changer for Earth's animals—it allowed mammals and birds to conquer cold environments and stay active at night, ultimately leading to the diverse species we see today in every climate on the planet.
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