All extra-embryonic membranes:

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(B) Extra-embryonic membranes include the amnion,chorion,yolk sac,and allantois. These membranes are derived from the trophoblast and embryonic disc b

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Do not take part in the embryo formation.

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(B) Extra-embryonic membranes include the amnion,chorion,yolk sac,and allantois. These membranes are derived from the trophoblast and embryonic disc but are not part of the embryo proper. Their primary functions include protection,nutrition,respiration,and excretion for the developing fetus,but they do not contribute to the formation of the embryo's body tissues.

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