One of two offspring produced in the same pregnancy. Use with P31 on items for one twin

Twin (Under CC License)

Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.

Twin News and Videos   LIVE

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NASA released the results from its Twins study on Thursday after studying the changes in astronaut Scott Kellys body while and after he spent 340 days aboard the..
1 week ago • WorldNews


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