Question

part a
the substance that maintains body temperature, and acts as a lubricant and protective cushion is
fats.
water.
carbohydrates.
protein.

Explanation:

Water helps maintain body temperature through processes like sweating. It also acts as a lubricant in joints and other body parts and provides a protective cushion for organs. Fats mainly store energy and insulate. Carbohydrates are the body's main energy - source. Proteins are for growth, repair, and various biological functions.

Answer:

water