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OpenStudy (anonymous):

What layer is made up of the chorion amnion and yolk sac? And then what layer is made of ectoderm mesoderm endoderm?

OpenStudy (blues):

I believe the chorion amnion is mesodermal...

OpenStudy (anonymous):

chorion is formed by extraembryonic mesoderm and the two layers of trophoblast. the amnion is in contact with the Mesoderm.

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