In a study of mothers who used combinations of alcohol, marijuana, and cocaine during pregnancy, it was found that they produced children who
a. could not be distinguished from those produced by mothers who used alcohol only.
b. had less gray matter than other children for the first few weeks of life, but who were subsequently quite normal.
c. had less white matter than other children.
d. had less gray matter than other children at least until age 10-13 years.
Question 2
Bending a joint requires
a. relaxation of extensors and flexors.
b. contraction of extensors and flexors.
c. relaxation of extensors and contraction of flexors.
d. contraction of extensors and relaxation of flexors.
Results from sequential study of two cohorts tested at three ages and at three different points in t
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