Which statement does NOT correctly describe a difference between a rock and a mineral? A. Minerals are found in all types of environment while rocks are found in specific environments.
B. A mineral has a definite crystal structure which is not the case in a rock.
C. The hardness of a mineral is greater than that of a rock.

D. The composition of a mineral is uniform while a rock's is not.

The arrangements of lipids in the membrane makes the cell semi permeable .

It's important for a woman to know she is pregnant within the first trimester so she won't consume any alcohol or cigarettes which will harm the baby.

B)

Na+ loss through sweet plus the dilution has lowered na+ concentration outside of neurons, altering the na+ equilibrium potential. sodium exists more outside the cells than inside. when na+ is lost by sweat plus the dilution( because they drink a lot of water) changes the concentration outside the cell, forcing the water to enter the cell and attempt to balance the concentration inside/outside.the problem is that the abundance of water will cause the cells to swell. most cells can adapt, however, the brain cells can't that's why the runner has confusion and can't control the muscles.  if not treated and this occurs in less than 48 hours, it can be immediately fatal .