Question

what is the primary reason the body needs nutrients?
to aid in new growth
to reduce oxygen in the body
to help wounds heal slowly
to fight bacterial infections

Explanation:

Nutrients are essential for various bodily functions, and one of the primary ones is to support new growth. They are not for reducing oxygen, nor for slow - wound healing. While some nutrients can contribute to immune function against bacterial infections, the overarching primary reason is new growth.

Answer:

to aid in new growth