Why do terrestrial forms require freshwater?

(i) Why do terrestrial forms require freshwater?
(ii) Give two examples where freshwater can be found in the frozen form on the Earth.

(i) The osmotic concentration of terrestrial forms is low. They can neither store nor eliminate high amounts of dissolved salt present in sea water. Therefore, they require freshwater to maintain the balance of salts within the body.
(ii) Ice-caps over poles and glaciers contain freshwater in frozen form.