Question

what is the reason for the birth of twins ??

Answer 1

When more than one egg is fertilized in a cycle of ovulation then twins are born.
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HOPE it helps

Answer 2

Twins form in one of two ways: Identical twins occur when a single fertilized egg splits into two. Identical twins look almost exactly alike and share the exact same genes. ... Fraternal twins occur when two, separate eggs are fertilized by two, separate sperm. I hope u get it