Birth defects can result from genetic or environmental causes.
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Q98: Histogenesis must precede organogenesis.
Q99: Stage three of labor ends with the
Q100: Stage two of labor ends with the
Q101: All teratogens are also mutagens.
Q102: Identical twins must have the same color
Q104: Fertility drugs increase the likelihood of having
Q105: Fraternal twins can be of different sexes.
Q106: Abruptio placentae occur when the placenta pulls
Q107: Ectopic pregnancies are always fatal to the
Q108: It is possible for identical twins to
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