- They have no circulatory or respiratory system.
- coelomic fluids transport nutrients and oxygen to all parts of the body
- A kidney like organ, the nephridium, filters the waste of the coelomic fluid.
- Gas exchange takes place across the body wall.
- They have a complete, U-shaped digestive system with a mouth, twisted intestines, and anus.
- Their nervous system is composed of a bundle of nerves inside the tip of the introvert, and a nerve chord running ventrally down the body.
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