what do ribbon worms use to feed?
Food enters the mouth and is digested in the intestine; the nutrients diffuse throughout the body (there are no circulatory or respiratory systems). The undigested materials are discharged from the mouth (there is no anus). Ribbon worms have more highly developed circulatory and digestive systems. Prey, such as small ï¬sh and polychaete worms, are speared by a sharp, sticky extension called a proboscis, which the ribbon worm extends from a recessed area in its head region.