recall that the lungs, kidneys and skin are the organs of excretion.
-1) lungs- lungs excrete carbon dioxide- waste from respiration that need to be eliminated from the body.
-2) kidney- kidneys excrete excess water, the molecule urea (the nitrogen waste from amino acids- we cannot store them so we excrete them) and salts.
-3) skin- known to excrete water (sweat), salts (sweat), and a little bit of urea. (mainly water and salt)
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