What is the answer I’m confused

Explanation:

Protein :Any of numerous large, complex naturally-produced molecules composed of one or more long chains of amino acids, in which the amino acid groups are held together by peptide bonds.bile :A bitter brownish-yellow or greenish-yellow secretion produced by the liver, stored in the gall bladder, and discharged into the duodenum where it aids the process of digestion.digestion :The process, in the gastrointestinal tract, by which food is converted into substances that can be utilized by the body.nutrient :A source of the nourishment, such as food, that can be metabolized by an organism to give energy and build tissue. insulin : A polypeptide hormone that regulates carbohydrate metabolism.

Hope this will help you