What causes the protein digestion there?

The reason of the protein digestion process is that the dietary protein is reduced into a group of amino acids in the gastrointestinal tract. Proteins are globular molecules that are comprised of smaller molecules called amino acids.

Enzymes and Amino Acids

Explanation:

Mechanical digestion of protein begins in the mouth. There are two enzymes in our saliva called amylase and lipase. They mostly break down carbohydrates and fats. Then they are transferred to the stomach and at last go to small intestine. Once a protein source reaches our stomach, hydrochloric acid and enzymes called proteases break it down into smaller chains of amino acids. In this way chemical digestion of protein begins in the stomach and ends in the small intestine.

The answer will be d

Ithink option a is correct because you cannot donate a different blood group than yours because it won't match.option a says betsy can donate to mark. they have the same blood group so donation can happen.