Word: fetal
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Dates: during 1928-1928
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Physical. In the genus homo there are three kinds of twins, Fraternal, Identical, Siamese. Fraternal twins are twins in time only. They make their entry into the world together but are completely separate individuals, the product of two fertilized eggs, having separate fetal membranes, not necessarily of the same sex, and as different biologically as any two members of the family born at different times. The young of most animals that produce litters are like fraternal twins; a fertilized egg for each animal...