Zoology - Excretory Products and their Elimination Question with Solution | TestHub

Organisms found in fresh water have a problem of excess internal water because of endosmosis. Organisms found in ocean or salt water have a problem of low internal water content due to exomosis. For aquatic organisms the quality (chemical composition, pH) of water becomes important. Many freshwater animals cannot live for long in sea water andvice versabecause of the osmotic problems they would face.