Question

Ammonia excreated by aquatic animals as and when formed because

Answer 1

aquatic animals are always living in water and have more amount of water in their body so they excrete in form of ammonia

Answer 2

Nitrogenous wastes in the body tend to form toxic ammonia, which must be excreted. Mammals such as humans excrete urea, while birds, reptiles, and some terrestrial invertebrates produce uric acid as waste. Uricothelic organisms tend to excrete uric acid waste in the form of a white paste or powder.