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time.com > Evolution’s next trick was developing a way for animals to deal temperature fluctuations. In the long arc of evolution,two strategies have emerged: one is to let your body’s temperature change the temperature around it,which is what creatures did for the first three,a half billion years or so. If necessary,these animals warm themselves by basking in sunlight or sitting on warm rocks. This heat management strategy survives today in fish,frogs,lizards,alligators,,all the reptiles,amphibians. Scientists call them ectotherms; you,I call them cold‑blooded.
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