The maintain homeostasis in the cell by controlling what comes in and out of the cell.

Aperson who doesn't have enough calcium in his or her diet is at risk for developing bones that are weak and break easily. this condition is known as  a.  osteoporosis.    b.  crohn's disease.    c.  celiac disease.    d.  hemophilia.

If you are caught in a flash flood, or sea water rushing your way, drive to the ground you can find. highest lowest nearest darkest

Describe the overall function of the nervous system