holliewolf6290 holliewolf6290
  • 18-10-2017
  • Biology
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The placenta develops from the outer cells of the

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Kalahira
Kalahira Kalahira
  • 28-10-2017
blastocyst The outer layers of the blastocyst turn in to the trophoblast after implantation. The trophoblast forms the placenta.
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