| http://www.w3.org/ns/prov#value | - Which of the following is not one of these membranes? amnion yolk sac allantois CHORION ??? ??? ??? All exchanges between mother and embryo occur ________. across the chorionic membrane ??? ??? ??? In the human, this germ cell layer gives rise to many of the organ systems, including the skeleton, skeletal muscles, walls of GI organs, urinary system, and circulatory system. mesoderm ??? ??? ??? The
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