Earthworms
- An earthworm is a tube-shaped, segmented annelid that is commonly found living in soil and that feeds on live and dead organic matter.
- Earthworms have no special respiratory organs. Gases are exchanged through the moist skin and capillaries where the oxygen is picked up by the hemoglobin dissolved in the blood plasma and carbon dioxide is released. Water as well as salts can also be moved through the skin by active transport.