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Twins are two babies develop in the same pregnancy.Di Di twins are two major types, Identical or fraternal. Identical category is formed due to fertilization of one egg with a sperm, then single fertilized egg is divided to two with same identical chromosomes and genetic characters and that is called di di twins.

fraternal twins come from fertilization of two different eggs with two different sperms  to form 2 nearly identical twins or completely different twins.

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