Under what circumstances can twins be born in humans?
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when when two eggs are fertilized with separate two sperm then it forms twins baby or when a single zygote split and form to embryos.
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Fraternal (Non-identical) 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.
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