The Circulatory System in the Earthworm

Multiple Choice

The circulatory system in the earthworm

A) is absent since all respiration is across the epidermis.
B) is an open system where hemolymph washes through body sinuses.
C) has a dorsal vessel as the main pumping organ.
D) has no pumping structure but depends on the action of body muscles to move the blood.
E) has five pumps that circulate blood first to the gills and then to the rest of the body.