In the cold Arctic, there are no small mammals. Why? Use surface to volume ratio to compare the loss of body heat of small animals to large animals in frigid temperatures. No calculations are required. Minimum of 75 words.

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In an arctic environment, animals must do everything that is possible to conserve body heat.  This is why no small mammals evolved in that kind of environment.  Smaller animals have a very small interior body volume, thus they have a small surface to volume ratio.  That means that a relatively larger percentage of their interior body volume is adjacent to their surface skin, thus allowing heat to escape their bodies more easily.  Larger animals, on the other hand, have a larger surface to volume ratio.  Much less of their body volume is adjacent to surface skin, so more of their body heat is naturally retained.

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