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Twins are two offspring produced by the same pregnancy. Twins can either be monozygotic ("identical"), meaning that they develop from one zygote that splits and forms two embryos, or dizygotic ("fraternal"), meaning that they develop from two eggs, each fertilized by separate sperm cells.
This category has the following 6 subcategories, out of 6 total.
Pages in category "Twin"
The following 28 pages are in this category, out of 28 total. This list may not reflect recent changes (learn more).