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The Endowment for Human Development
The Endowment for Human Development
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Bronchial Tree


4 months, 2 weeks

From The Biology of Prenatal Development.Buy Now

Script: وفي الجهاز التنفسي، فإن الشَّجَرَة القَصَبِيَّة تصبح شبه مكتملة الآن.

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
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