Final answer:
The brain is divided into three major parts: the cerebrum, cerebellum, and brain stem. In the first years of life, the brain undergoes rapid changes in size and complexity.
Step-by-step explanation:
The brain is divided into three major parts: the cerebrum, cerebellum, and brain stem. The cerebrum is the largest part of the brain and is responsible for functions such as thinking, memory, and motor control. The cerebellum helps with coordination and balance, and the brain stem controls vital functions like breathing and heart rate.
In the first years of life, the brain undergoes significant changes. The size of the brain increases rapidly, with the brain of a 2-year-old being 55% of its adult size. During early childhood, the frontal lobes, which are associated with planning, reasoning, memory, and impulse control, grow rapidly.