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Furkat [3]
3 years ago
9

The placenta develops from the outer cells of the

Biology
1 answer:
statuscvo [17]3 years ago
4 0
<span>blastocyst The outer layers of the blastocyst turn in to the trophoblast after implantation. The trophoblast forms the placenta.</span>
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Answer is Serous membrane.

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The serous membrane are lying the cavity of some certain internal organs of the body, such as the lung and the heart. The fluid produced by the serous membrane,[ serous fluid], serves as lubricant to reduce friction occurring from muscle movement.

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