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The Endowment for Human Development
The Endowment for Human Development
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Heart and Circulatory System


3 weeks

From The Biology of Prenatal Development.Buy Now

Script: as di fos blכd sεl dεn apiya na di yok sak blכd vεsul dεn de fכm כlsay na di εmbrayo εn di tubula at de apiya.

כlmos kwik-kwik wan di at we de gro fas fas de fol insay insεf lεk we sεpret rum dεn de bigin fכ divεlכp.

di at begin fכ bit 3 wik εn wan de afta fatalayzeshכn.

di sakuletori sistεm na di fכs sistεm na di bכdi כ grup כgan dεm we rilet fכ mek i ebul wok.

All ages referenced to fertilization, not last menstrual period.
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