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Earthworm is a hermaphroditic animal but...

Earthworm is a hermaphroditic animal but always shows cross-fertilisation. Why?

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Earthworm has both male and female reproductive systems but always shows cross-fertilisation due to :
(i) Protandrous condition (i.e. testes maturing earlier than ovaries)
(ii) Differential position of male and female gonopores.
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