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The Endowment for Human Development
The Endowment for Human Development
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Circadian Rhythms


4 months, 3 weeks

From The Biology of Prenatal Development.Buy Now

Script: از هفته 19 حرکت رویانی، فعالیت نفس کشیدن، و ضربان قلب شروع به پیروی از دوره ھای روزانه می کند که نام آن ریتمهای 24 ساعتی می باشد.

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
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4D Ultrasound
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Bronchial Tree
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Responds to Sound
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