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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

ByAdrian Sanchez

9 Dec 2017

1

0

588

Date:

jan 4, 2018

Now

~ 8 years and 5 months ago

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