The proximodistal developmental trend states that first

The proximodistal developmental trend states that first
a.   synaptogenesis happens, followed by myelinization.
b.   small muscles develop, followed by large muscles.
c.   inner organs develop, followed by extremities.
d.   the head develops, followed by the body and legs.


Most neurons in the young brain have already been formed as early as
a.   the time of conception.
b.   the end of the second trimester of pregnancy.
c.   the age of four years.
d.   the age of six years.


Development of specific areas of the cerebral cortex in early infancy leads to strong improvements in
a.   the vital function of digestion.
b.   the vital function of respiration (breathing).
c.   voluntary intentional movements.
d.   the strength of innate reflexes.