Did the other organs all move together into their location, how did the brain get left out?
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We keep our gaming consoles, sound systems, Blu-ray player, and streaming boxes close to the TV. If they were far away, you would have to deal with long lengths of cable connecting them. This is annoying to support (longer cable costs more) and risks the signal being degraded over distance.
The same is with our brains. Our brain is in our head because our head contains many of our sensory organs. Sight, hearing, smell, and taste are all located in our head. Having a short distance between the sensory organs and our brains limits the “cable” (nerves) lengths needed to connect to our brains. This reduces the energy needed to grow and maintain the nerves and reduces the time it takes to send signals to the brain.
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