removal of undigested food from the body through the anus is not considered part of excretion

yeah!itz called egestion..

removal of ONLY NITROGENOUSWASTES is called excretion

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is removal of undigested food from the body considered to be excretion? why?

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yes.Because removal of only NITROGENOUS WASTES is called excreation
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Removal of undigested food through anus includes in the process of digestion and hence it cannot be considered as the process of excretion.
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Yes.
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