Have you ever watched a colony of ants work? Some of them explore, looking for new food. Some of them march along, fetching the food already found. Some guard the nest. Some feed the babies. Some care for the queen.
You could imagine brain working in a similar way. Every part has its assigned role, although many of those parts could easily have taken up a different role. They all fell into line as you developed, like soldiers, and they work together to exchange information and make sure that the whole machine ticks over together.
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