#1 How is the nitrogen cycle
similar to the carbon cycle?
They are both used by plants, as either CO, or
Ny, to create oxygen.
Both elements can be used to creale larger
molecules but cannot be broken down again.
Both are "fixed" by eukaryotes
Bements are removed from the atmosphere
and then used by organisms to create larger
molecules necessary for life.

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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 .