Which statement correctly describes one characteristic of the tubelike digestive system of an earthworm?
A. Digestive enzymes are not used in the system.
B. The shape of the system eliminates the need for egestion.
C. Various parts of the system perform different digestive functions.
D. The shape of the system allows food to be processed by intracellular digestion.
The mouth is used for ingestion, the intestine for digestion, and the anus for egestion. Worms perform extracellular digestion because the food is digested outside of individual cells; food is digested within a tube. Enzymes are necessary for all chemical digestion.