I have learnt that only a single sperm can enter the egg then how twins,etc are born
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Sometimes during fertilization . The zygote splits into two parts and two different embryos are formed which are called monozygotic twins( twins from one zygote or identical twins). Sometimes two sperm cells fertilize two different ovaries and two zygotes are formed from fertilization of two ovaries by two sperms such twins are called dizygotic twins( twins from two different zygotes or non - identical twins).
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