raisahussainkhel70 raisahussainkhel70

22-04-2017
Biology

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As a fertilized egg divides, the cells differentiate because they

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Shortykatiemcmiken20 Shortykatiemcmiken20

22-04-2017

Certain genes/cells are activated/turned on (how ever you want to word it)

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mycreed32 mycreed32

22-04-2017

They are twins. Did the embryo split too?

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