Constipation and diarrhea, are both caused by a similar thing. Constipation is caused whenever there is too much buildup of food, or other food based material in the intestines. Usually this passes itself, yet constipation can also cause diarrhea through a bowel movement.
It occurs only in cells in the reproductive structures of organisms.
Meiosis only occurs in the reproductive cells, producing gametes with half of the genetic information as the parent cell.
Because it is polar and it is to large to cross the membrane and because the concentration gradients are to strong so they have to be diffused.
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