What is the biological definition of "excretion"?
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The removal of undigested food from the body.
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The removal of toxic materials and waste products of metabolism.
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The release of energy from food.
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The intake of nutrients into the body.
📝 Detailed explanation
Excretion refers specifically to metabolic waste (like CO₂ or urea), whereas the removal of undigested food is egestion.
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