Answer 1:
In biology, we say that the anus is the
opposite of the mouth. Animals from humans to
earthworms have both openings. The mouth is the
start of the digestive tract: it's where animals
put their food. The animal then digests its food,
breaking it apart to take the nutrients it wants,
and collects what's left over as waste. The
anus is the end of the digestive tract: animals
get rid of the waste from there.
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