What causes the protein digestion there?

Enzymes and Amino Acids

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.

answer; i believe is(b)converging

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.