The heart and nervous system begin to form when the developing child is categorized as a(n) ________
A) fetus
B) zygote
C) embryo
D) blastocyst
Answer: C
Rationale: 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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