How can women deliver twins? how does the fertilisation differ from single child to twins/triplets?
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Twins could result from the release of two separate eggs, or in the case of triplets, three separate eggs. Twins could also result from a single fertilized egg splitting in two very early on as an embryo, and then each embryo continuing as if it is the only one. In the case of multiple eggs, twins are fraternal. And in the case of the same egg dividing and then continuing as separate fetuses, twins are identical.
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