Which of the following is NOT true about estuaries? * -Act as natural buffers from storm surges and protect communities from flooding
-help decrease erosion
-Filter pollutants
-Are among the most productive environments on Earth
-All of the above are true.

Air occupies

Reproduction i think

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 .