A teratogen is
A) a deformed baby.
B) a specific sedative used in the 1950s in Europe.
C) a chemical agent, infectious agent or environmental factor that causes birth defects.
D) a stage of development in the mid-fetal period.
Correct Answer:
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Q56: The neural tube of the embryo develops
Q58: In human embryos, the yolk sac is
Q59: The solid mass of cells that results
Q60: Fertilization is to zygote as
A) egg is
Q61: Which of the following adult structures derives
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