Nervous System

Does every living organism have a nervous system?
Answered by Discovery Channel
  • Discovery Channel

    Discovery Channel

  1. Not all living organisms possess a highly specialized nervous system like humans [source: Farabee]. But this isn't to say that organisms without an advanced nervous system cannot make sense of their environments. For instance, cnidarians and echinoderms -- organisms such as jellyfish, coral and starfish -- use "nerve nets" to process sensory information in place of a brain or a nervous system [source: Farabee]. Bilateral organisms, or those with right and left sides, usually develop a head or sensory center of some sort. Worms, for example, possess a basic brain and nerve that runs through the body but lack many other components of a complex nervous system. Like humans, organisms with a backbone often have a more sophisticated nervous system.

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