to separate from the blood and cast out; to perform excretion.
Excretion is a biological process by which metabolic waste products and toxic materials are removed from the body of an organism. It's an essential part in life, because it gets rid of all the poisons and etc. There are three types of waste, they are urea, sodium and excess water.
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Mrs Gren, Which is: Movement Reproduction Sensitivity Growth Respire Excretation Nutrition