What is the main difference between excretion and egestion?

Excretion removes salts, egestion removes water.
Excretion removes metabolic waste, egestion removes undigested food.
Excretion happens in the lungs, egestion happens in the kidneys.
There is no difference.

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Excretion involves products of chemical reactions in cells (like CO₂ or urea). Egestion is just passing out material that was never part of the body's cells.

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