An advertising campaign urges pregnant women to get good prenatal care by saying that all of the structures that we recognize as human (including arms, legs, eyes, internal organs, and a beating heart) have already developed early in pregnancy. Having studied prenatal development, you know that the most accurate statement is that these structures are present, at least in rudimentary form, by:

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As noted in the textbook, by the end of the embryonic period, the embryo has developed arms, legs, fingers, toes, a face, a heart that beats, a brain, lungs, and all of the major organ systems. The embryonic period lasts through the eighth week (i.e., end of the second month).

An Advertising Campaign Urges Pregnant Women to Get Good Prenatal