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4 ene 2018 año - Week 4

Descripción:

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 dic 2017

1

0

575

fecha:

4 ene 2018 año

Ahora mismo

~ 7 years and 9 months ago

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