Is there a special reason? What is so superior to this design than let's say the one of arthropods?
Do you think if complex and intelligent life exists somewhere else in the universe could it be made of arthropod like beings with an exoskeleton?" Look to energy conservation in all things.
It was always a remarkable set of correlations to me that when I considered evolution from an energy conservation perspective that all things just made sense.
The evolution of sensing ability makes sense as a way for simple organisms to identify gradients and navigate within those fields. (Be those luminous , chemical or other gradients)
Sensing ability soon emerged the innovation of memory elements by storing aspects of sensed information for later comparison and poof the early first brain like comp…