That is when extinction occurs. Hope I helped!
The choice that best fits and answers the question is;
D: absorption
I hope this answer is sufficient and has aided you.
Cheers.
Parietal cells within the stomach lining secrete hydrochloric acid that lowers the pH of the stomach. A low pH (1.5 to 2) activates pepsin. Acetylcholine, gastrin, and histamine stimulate the proton pump in parietal cells to release hydrogen ions and decrease pH.
The last one, the planets formed at the same distance from the sun.
Generation of ATP. Hope it helps.
