The correct order of the evolution of nervous systems from simple to complex is:

A) nerve net, segmentation, ganglia, spinal cord, brain.
B) spinal cord, nerve net, brain, ganglia, segmentation.
C) brain, spinal cord, nerve net, segmentation, ganglia.
D) ganglia, nerve net, segmentation, brain, spinal cord.

Nerve Net

A simple form of neural organization found in cnidarians and ctenophores, featuring a diffuse network of interconnected nerve cells.

Evolution

The process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.

Nervous Systems

The network of nerve cells and fibers transmitting signals between different parts of the body, comprising the central and peripheral nervous systems.