Ectotherms, also known as cold-bloods, are organisms that do not produce enough heat through their metabolic processes (chemical reactions within the organism's cells) to sustain themselves, all life on earth but two animal classes are ectotherms. There is a misnomer behind calling ectotherms cold-blooded, as they are not able to survive at a low body temperature, they last longer than endotherms under cool temperatures, but they, like endotherms, need a warm internal temperature to survive. In short, they can survive at lower temperatures longer than endotherms, but ultimately need to be at a warmer internal temperature to stay alive.

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