Identical twins also known

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Identical twins, also known as monozygotic twins, form when one egg, fertilised by one sperm, splits early on. Finding an explanation for why the egg splits has proven elusive. The leading hypothesis is that it occurs at random. Identical twins occur in few species: humans, dogs, cattle, horses and pigs. From an evolutionary perspective, their existence doesn't make much sense, since producing offspring with genetic diversity provides a better chance of survival.

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