Assertion [A]: Excretion is one of the processes that must happen in our body.
Reason [R]: Excretion is the process of movement of waste materials out of the body.

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Solution

Several byproducts are formed in our body as a result of metabolic activities. The excess amount of these byproducts becomes harmful to our body. So it must be eliminated from our body. The process of elimination of waste materials from our body is called excretion.

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