Earths food chain starts with the sun then it goes to producers such as plants that absorbs the sun’s energy to produce their own “food”
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.
<span>Are pollution can cause acid rain and the acid rain can hurt lots of living things. </span>
Animals obtain nitrogen by eating plants which has absorbed nitrogen from the soil.
As scientists drill the sample they bring up is. Called a core sample
