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Playlist: Arms and Legs

The Developmental Period


#210, Movie 1 of 34

7 weeks, 4 days

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The developmental period before birth is increasingly understood as a time of preparation during which the developing human acquires the many structures, and practices the many skills, needed for survival after birth.
Buy NowFrom The Biology of Prenatal Development.     All ages referenced to fertilization, not last menstrual period.