Problem:
The brain is separated into different regions, and different regions perform different tasks. Well, what are the differences between these regions on the cellular/systemic level.
Required:
Question 1: The brain is made up of neurons and other cells, but how come one part is used to process sound and another is used to process, say, smell?
Question 2: Are they like different computer circuit boards - using the same components but are wired differently?
Question 3: Why did evolution not come up with a brain that uses the entire brain to process something, would that not be more efficient?
Please explain all the answers in detail.