What are the two main functions of keeping the stomach highly acidic?
a. increasing the absorption of carbohydrates
b. breakdown complex lipids molecules
c. denature proteins to ease their breakdown
d. kill bacterã­a to prevent food borne disease
e. assist in the breakdown of starch and cellulose

Two main functions of keeping the stomach highly acidic are:

 C) Denature proteins to ease their breakdown

 D) Kill bacteria to prevent food borne disease

As, the stomach maintained a high acidic to kill the all bacteria and denture the protein for ease in the digestion system. The diaphragm keeping acid in out stomach. It basically help stomach in the activation of enzymes pepsin which helped in the breakdown of the proteins. And the acidic stomach prevents from the certain microbes produced in our stomach.  

atp is used for energy.

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!