Elongate, segmented, worm-like phylum of around 15,000 species. Formation of true coelom and segments in annelids. Remember, muscles can only contract. So muscles not only act as antagonists, but can present a thrust against the environment.
Earthworms have a good regenerative capacity.
Earthworm skin moist for respiration, with a thin cuticle for protection secreted by the skin. The earthworm is segmented throughout, externally seen as annuli or rings . Human digestive system, from mouth to anus. Stomach main storage organ, omnivorous diet. Earthworm digestive system runs the length of worm, with soil-based diet.