Question: 1.4. Body organs fi rst begin to form and function during the period of the ______________ ; within 6 months, during the period of the
1.4. Body organs fi rst begin to form and function during the period of the ______________ ; within 6 months, during the period of the _______________ , the organs are suffi -
ciently functional to allow a good chance of survival.
a. zygote; embryo
b. zygote; fetus
c. embryo; fetus
d. placenta; fetus
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