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Unformatted text preview: water moves in by osmosis water must be pumped out NH4 OK metabolite: diluted by copious H2O Terrestrialization: Water must be conserved NH4 problem w/out dilution Mechanisms evolve to conserve water resorb water from feces and urine urea and uric acid instead of NH4 less toxic, less water needed Concentration of urine above body salinity. ONLY mammals and birds Most Animals CAN NOT concentrate their urine more than their body salinity Loops of Henle...
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