FanPost

5/15/2012 OT



lazies

A twin is one of two offspring produced in the same pregnancy.[1]Twins can either be monozygotic ("identical"), meaning that they develop from one zygote that splits and forms two embryos, or dizygotic ("fraternal") because they develop from two separate eggs that are fertilized by two separate sperm.

In contrast, a fetus which develops alone in the womb is called a singleton, and the general term for one offspring of a multiple birth is multiple.

Any twins in here? Twins in your family? Aren't twins weird?

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