The interior of your stomach is acidic because a protein in the membrane lining your stomach uses energy from atp to pump hydrogen ions (acid) against their concentration gradient from low to high concentration. the movement of these hydrogen ions (acid) would be described as

answer; /// (c) i do believe that the correct answer is ; an unstated guarantee that goods will be to the consumer's liking;

the answer is implicit statements

answer; internal; covert processes;

answer; (d) they are in charge of the ushers and making sure the audience gets to their seats on time; they also control the box office; i know (c) is wrong and (b) don't make sense;