under what circumstances twins are born in humans
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Fraternal twins are formed when two egg cells are fertilized; each egg by a different sperm so that two embryos are formed.
Identical twins are formed when one egg after being fertilized by one sperm, divides into two halves. The two halves are genetically identical.
Identical twins are formed when one egg after being fertilized by one sperm, divides into two halves. The two halves are genetically identical.
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