Body wall has outer circular and inner longitudinal muscles. Food Worm takes in soil and decaying plants, so soil is turned and aerated. Worm also discharges nitrogenous waste, which helps plants grow Food in through muscular pharynx to esophagus. Crop stores food Gizzard is thick, muscular, and grinds food against sand Long, straight intestine is for chemical digestion and absorption. Intestine has a long fold, the typhlosole, which increases surface area for absorption.
Wastes leave by the anus.
Other organ systems Circulatory system is closed, efficient. 2 longitudinal blood vessels, dorsal and ventral. Gas exchange through skin. O2 carried by hemoglobin. Excretory system has paired metanephridia in almost every segment.