Authors:
  • Basically there are two types of animals: animals, and animals that have no brains; they are called plants. They don't need a nervous system because they don't move actively, they don't pull up their roots and run in a forest fire! Anything that moves actively requires a nervous system; otherwise it would come to a quick death.

    "The Electric Brain". The NOVA Interview, www.pbs.org. October 23, 2001.