Final answer:
The brain becomes more complex during adolescence, allowing for cognitive development.
Step-by-step explanation:
Brain development is a complex and highly orchestrated process that begins early in embryonic development and continues throughout life. The human brain undergoes a series of stages, each characterized by specific events and milestones.
The brain does not increase in size very much during adolescence, but it becomes significantly more complex. The number of folds in the cerebral cortex increases, and synaptic pruning occurs. Myelination also increases. Overall, the brain becomes more efficient and functional during adolescence, allowing for cognitive development.