The pharynx, usually found in segments 4 & 5, is used to
swallow food.
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The segment number of the pharynx on an earthworm is around 4-7. Hope that helps.
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Pharynx
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The pharynx is the back of the throat (divided loosely into
nasopharynx and oropharynx) which allows food to enter the
oesophagus and air to enter the thrachea.