Which of the following describes the embryonic period?
A) the period during which the blastocyst moves down to the uterus and begins to implant in the lining
B) the period during which the major organs and structures of the organism first develop
C) the period during which the zygote is formed
D) the period during which the skeletal, organ, and nervous systems become more developed and specialized
Answer: B because the embryonic stage spans weeks two through eight, during which time the embryo begins developing major physical structures such as the heart and nervous system, as well as the beginnings of arms, legs, hands, and feet.
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