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.
B. Crab
is your answer
An crab has an exoskeleton
hope this helps
I believe it is azotemia.
Answer:
B) A difference in pressure across a distance.
