Question 1 Report
Removing undigested food as faeces is called egestion, not excretion, because the material
Egestion and excretion are separated by where the material came from. Faeces is made of undigested food that passed through the gut but was never absorbed into the body's cells, so removing it is egestion. Excretion, by contrast, removes wastes made by the cells' own chemical reactions, such as urea or carbon dioxide. The faeces is not a product of respiration and is not simply water, so the correct reason is that it was never absorbed into the body's cells.
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