Ciliated worms.
Their body is covered with ciliated epithelium, which assists them in movement. There is no body cavity. Inside is spongy tissue - parenchyma. Free-living flatworms feed mainly as predators and move by crawling or swimming.
Their body is covered with ciliated epithelium, which assists them in movement. There is no body cavity. Inside is spongy tissue - parenchyma. Free-living flatworms feed mainly as predators and move by crawling or swimming.