The first warm-blooded vertebrates are:

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(C) Warm-blooded animals, or endotherms, are those that can maintain a constant body temperature regardless of the environment. Among the vertebrate c

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Aves

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(C) Warm-blooded animals, or endotherms, are those that can maintain a constant body temperature regardless of the environment. Among the vertebrate classes, $Aves$ (birds) were the first to evolve this trait. $Mammals$ are also warm-blooded, but $Aves$ appeared earlier in the evolutionary timeline as endothermic organisms. Therefore, $Aves$ are considered the first warm-blooded vertebrates.

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