part a\nthe substance that maintains body temperature, and acts as a lubricant and protective cushion…

part a\nthe substance that maintains body temperature, and acts as a lubricant and protective cushion is\nfats.\nwater.\ncarbohydrates.\nprotein.
Answer
Brief Explanations:
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