The chorion is the_and the amnion is the . site where an embryo is implanted into the uterus; the outer protective membrane around the embryo outermost covering of an embryo and helps form the placenta; a membrane that encircles a developing embryo site from which primary germ layers develop; the site from which secondary germ layers develop part of the blastocyst that is not the inner cell mass; inner cell mass none of the above

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