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jan 4, 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)
Added to timeline:
Biology Timeline 1
By
Adrian Sanchez
9 Dec 2017
1
0
572
Date:
jan 4, 2018
Now
~ 7 years and 9 months ago
Images:
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