What is excretion? What strategy is used by animals to do this? - Vidyadip

Question

What is excretion? What strategy is used by animals to do this?

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Answer

The biological process involved in the removal of harmful nitrogenous metabolic wastes from the body is called excretion. Various metabolic activities in animal body generate these nitrogenous waste materials which should be excreted out.
Different organisms use varied strategies for excretion.
$\rightarrow$ Many unicellular organisms remove these wastes by simple diffusion from the body surface into surrounding water.
$\rightarrow$ Complex multi-cellular animals use specialised excretory organs to perform the same function.

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