Of the four extraembryonic membranes, only the ________ is not needed in order for an embryo to

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Of the four extraembryonic membranes, only the ________ is not needed in order for an embryo to develop properly.

a. Yolk sac

b. Allantois

c. Amnion because all are needed

d. Chorion

e. This is a trick question,

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Human Biology

ISBN: 9781305264540

11th Edition

Authors: Cecie Starr, Beverly McMillan

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