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Supplying the body with energy is not a function of protein.

Explanation:

Unlike carbohydrates or fats which can provide us with energy, proteins typically are used to build parts of the cell. In other words they are some of the raw materials the cell needs to make cells and tissues. When an excess of protein is eaten, the extra protein can be broken down into energy-yielding compounds.

answer; ///(b) it is composed of four protein chains and four heme groups;