During the embryonic stage,which event occurs?
A) An insulating layer of fat develops below the skin.
B) The digestive and respiratory systems mature.
C) The embryo grows to a length of 15 cm
D) The heart begins to beat.
Correct Answer:
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A)is
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A)involves
Q19: Each zygote contains _ chromosomes.
A)23
B)24
C)46
D)48
Q20: Developmental psychology is the study of:
A)the child,from
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