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2 Tripken AP PSI / Lifespan / Development Name: 109 At a GLANCE / PRENATAL DEVELOPMENT KNOW IT!! Zygote (10 days) ---Embryo (6 wks) ---Fetus (2 - 37 mos) Zygote: the fertilized egg; it enters a 2-week period of rapid cell division and develops into an embryo. ................
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