Biology

The correct answer is: B.Helps to build and repair body tissue.

Proteins are primarily responsible for building and repairing tissues in the body, including muscles, organs, skin, and more. They are essential for growth, tissue maintenance, and the body's ability to heal after injury.

Here's a breakdown of the other options:

A."Is the main source of energy for the body.": This is incorrect. While proteins can be used for energy when needed, they are not the main source of energy for the body. Carbohydrates and fats are the primary sources of energy. Protein is mainly used for building and repairing tissues....