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The Endowment for Human Development
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Eyes Produce Tears


6 months, 3 weeks

From The Biology of Prenatal Development.Buy Now

Script: Do końca 26. tygodnia oczy zaczynają produkować łzy.

Źrenice reagują na światło po upływie 27 tygodni. Reakcja ta reguluje ilość światła, jaka dociera do siatkówki w ciągu życia.

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