earthworms are bisexual, still self fertilisation is not possible. Explain. 

Earthworms are protandrous i.e., the testes matures earlier than the ovaries . Self-Fertilisation is not possible in them because of the relative position of the opening of the male and the female reproductive  organs .

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Self fertilisation is not possible because the male and female sex organs mature at different time of their life span. When the male gonads get matured, the female gonads doesn't get immediately matured. This leads in prevention of self fertilisation. I hope it's clear to you
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