Question

how does the presence of acid in the stomach help?

Answer 1

it kills the bad microorganisms and divides huge chunks of food into smaller particles

Answer 2

HCl also has another important role to play in the stomach during the digestion process. The presence of HCl in the body of the stomach causes the activation of enzymes. One of the proteins in HCl is used to convert the enzyme pepsinogen into pepsin. Pepsin breaks up the peptides from the protein