AP BIOLOGY

Detailed explanation-1: -Aquatic animals will excrete waste product in the form of ammonia gas which dissolve in water and these organisms are known as ammonotelic animals.

Detailed explanation-2: -Final answer: Aquatic animals like fish excrete their wastes in gaseous form as ammonia.

Detailed explanation-3: -Aquatic animals in general excrete ammonia. Ammonia is a small molecule that readily diffuses across skin and gills if sufficient water is available, but the kidneys inefficiently excrete ammonia. Ammonia is highly toxic, and animals cannot survive even moderate ammonia concentrations in their body fluids.

Detailed explanation-4: -In Hydra and Amoeba, ammonia is the main nitrogenous waste. Lizards, snakes, birds and insects excrete mostly uric acid but crocodiles and alligators excrete mainly ammonia though they are reptiles.

Detailed explanation-5: -Generally, aquatic animals excrete mostly ammonia, whereas terrestrial animals excrete either urea or uric acid. Ammonia, urea and uric acid are transported across cell membranes by different mechanisms corresponding to their different chemical properties in solution.