Answer:
b. hibernation to lower metabolism in the winter
Explanation:
Tundra, besides the one I live in apparently, are very, very dry because of the cold. This means that it may be helpful to hibernate for the part of the year where it is even too cold for plants and other animals.
I would say,
Aa.
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The answer is... -72
A. Supine is lying on the back; prone is lying with the back facing up
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