Which of the following cannot be an example of excretion?

Carbon dioxide is breathed out from the lungs

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Undigested food leaves the body through the anus

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Urea leaves the body in urine

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Water is removed through the kidneys

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Solution

The correct option is B
Undigested food leaves the body through the anus

Carbon dioxide, urea and water are excreted from the body in one way or the other. Removal of undigested food through the anus is not excretion. This process is called defecation.

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