The physical reason is that the nerves cross over each other inside the brain, and nerves on the right side of the brain cross to run down the left side of the body, etc. Nobody really knows exactly why this evolved.
narrow span of control is more efficient
i am not sure
Battery powered remote control cars are more efficient and economical.
Control
Hormones
Optic nerve
these are circuits that manages tha functioning of the system or in other words are the ones that helps in the proper functioning of the system.
What???
peripheral neurits
the benefit they had was control, no working (being lazy), and they didn't have to pay the slave
Operational control.
Operational control.