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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