Explain why the domestic rat requires more energy per unit weight than an elephant
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Most of the weight of the food, moreover, was required to meet energy needs; ... transformation is defined as follows: = ... are expressed in calories per unit of time or watts (Box 7.2).
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it depends on surface area .
surface area increases , heat loss is decreased .
in polar region small animals are absent , because their surface area is large as compared to volume with large animals , so heat loss ( energy released) is higher , so they can not survive .
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