Which of the following describes how different species depend on one another in a natural environment?
a. non-native kudzu out-compete native plants in the eastern united states.
b. giant african snails imported as pets damage native plants and crops in hawaii.
c. grasslands in the california floristic province have been converted into housing projects, shopping centers, and roads.
d. acacia trees of central and south america provide shelter for stinging ants, while the stinging ants snip surrounding plants that grow too close.

The answer is D because the tree depends on the ants to survive, and the ants use the tree as shelter

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 .