Donna is concerned about her adolescent daughter’s tendency to flare up at the mildest
provocations. Donna says that her daughter refuses to see reason sometimes and seems
unable to exercise much self-control. As a specialist in the development of adolescents,
you would tell Donna that her daughter’s behavior could partly be explained by the
biological reason that:
A.the prefrontal cortexinvolved in reasoning and self-controlhas developed fully by
early adolescence.
B.the corpus callosum, where fibers connect the brain’s left and right hemispheres,
thickens in adolescence.
C.by the end of adolescence, individuals have fewer, less selective, less effective
neuronal connections than they did as children.
D.the amygdalathe seat of emotions such as angermatures earlier than the prefrontal
cortex in adolescents.
Answer:
At birth, the newborn’s brain is about _____ percent of its adult weight.
A.10
B.25
C.50
D.75
Answer: