The correct answer is protein.
Protein being the macro molecule is involved in almost every function of the body. Some of the important functions of the protein in the body are given below.
- Like our nails and hair are made of keratin protein.
- All the enzymes that is involved in the metabolic reactions of the body are protein.
- As like carbohydrate and fat, protein has no reservoir in the body so it is taken by the body and is utilized by the body without being stored.