Chorion is composed of

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(D) The chorion is the outermost extra-embryonic membrane that surrounds the embryo and all other membranes in amniotes.It is formed by the fusion of

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All the above

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(D) The chorion is the outermost extra-embryonic membrane that surrounds the embryo and all other membranes in amniotes.It is formed by the fusion of the outer ectoderm (trophoblast) and the underlying somatic mesoderm.During early development,the trophoblast differentiates into two layers: the inner cytotrophoblast and the outer syncytiotrophoblast.Since the chorion includes these trophoblastic layers along with the somatic mesoderm,all the mentioned components contribute to its structure.

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