Earthworm is bisexual than why self fertilization is not found.
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In fact, most species do not self-fertilize, and many are physically incapable of self-fertilization. ... The reproductive organs of earthworms are positioned at different ends of their bodies, so that fertilization of the eggs is only possible when the worms are aligned in opposite directions.
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It is because it sexually reproducing organism meaning it requires one more partner. But earthworm doesn’t have a gender but if one earthworm takes the role of male then the other takes the role of female and vice versa.
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