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Earthworm Nervous System - Negative
Excellent self-healers, earthworms have the ability to regenerate a portion of the body when it is removed or damaged. If the posterior section of a worm is removed, then either a head or tail is regenerated. However, if a head grows back instead of the original tail, then the double-headed worm will starve. Anterior regeneration always results in a tail section being reproduced. Remarkably, portions of several worms can be united to make a single long worm.
