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      Bud Fudder
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      I’m curious about the evolution of cold-bloodedness (or warm-bloodedness, whichever evolved from the other).

      Does science have any idea when the evolutionary split occurred? What was the evolutionary advantage that gave it survivability? How many changes would be required for a modern animal to evolve to the other (for example, for a lizard to evolve warm-bloodedness)?

      Thanks in advance for any help.

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