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Which of the following statements is true about identical twins?


A) In the womb, up to 5 percent of identical twins develop their own placenta.
B) Twins are identical mainly due to dizygotic fertilization.
C) Identical twins turn out to be vastly different from each other in their personalities, intelligence, illness, and disease histories.
D) Identical twins develop from one fertilized egg.

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Karen has been using her stethoscope for many days to listen to her fetus' heartbeat. Today, for the first time, she detected her fetus' heartbeat. Karen must be at least ________ weeks pregnant.


A) six
B) eight
C) five
D) two

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According to Erik Erikson, a(n) ________ is an opportunity for adaptive or maladaptive adjustment.


A) sensorimotor stage
B) neural migration
C) pruning
D) identity crisis

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