Why do some animals and humans have set body temperatures that they need to maintain in order to live? And why do are dogs at different temperature? And do mice in montana have to be a different aperture than the ones in new mexico? That's a great question. So generally speaking, it's all about strategy, like evolutionary strategy and life history strategy. But geography also plays an important role, as doctor shane explains. Here he introduces us to allan's rule on how geography can affect penotypes.

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