reason behind the birth of twins
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Twins can occur either when two separate eggs become fertilized in the womb or when a single fertilized egg splits into two embryos. Having twins is more common now than it was in the past. According to the Centers for Disease Control and Prevention (CDC), twin births have nearly doubled over the last 40 years.
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It is because of the division of the zygote in early stages leading to the birth of identical twins.If 2 eggs are fertilized at the same time non-identical twins are formed
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