What two purposes do fatty tissues and fat under the skin serve for the body?

Subcutaneous translates to "under the skin.".

Explanation:

It contains not only fatty tissues but also blood vessels, which supply the skin with oxygen, and nerves. Subcutaneous fat is a shock absorber, helping to cushion our skin against trauma, and also stores energy, which the body uses during periods of high activity.

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the right answer is: time