- Excretion is a process in which toxic wastematerials produced during biochemical reactions (metabolic activity) in the cells are eliminated from the body.
- One of the Excretory product which is toxic to the body and has to be eliminated, is the nitrogenous waste material formed from either the nitrogenous compounds got by deamination of amino acids or breakdown of nucleic acids.
They are three types of nitrogenous waste materials formed predominantly in animals, they are
