Excretion in Invertebrates | Zoology
In a general way excretion can be defined as the separation and ejection of the metabolic wastes from the body, usually in aqueous solution. Metabolism produces a number of byproducts. Some of these byproducts are compulsorily excreted while others are used in different metabolic pathways. The excretory materials are removed from the body with the help of specialised excretory organs. [...]