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4 janv. 2018 - Week 4

Description:

The zygote attaches itself to the walls of the uterus. The placenta and the umbilical cord begin to form. (Source 1)

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Biology Timeline 1

ByAdrian Sanchez

9 déc. 2017

1

0

575

Date:

4 janv. 2018

Maintenaint

~ Il y a 7 ans et 9 mois

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