Biology

The correct answer is: C.stored energy

Proteins are not primarily used for storing energy. While they can provide energy in certain situations (when broken down into amino acids), their main functions are related to structure, signaling, catalysis (enzymes), and immune defense (antibodies).

Here's a breakdown of the other options:

A.Create muscle: Proteins are the building blocks of muscles, as muscle fibers are made of proteins like actin and myosin.

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