Worms usually lack legs or other limbs. Some types have bristles that help them to move. Worms vary in size. Some are invisible to the naked eye. Others are more than 100 feet (30 meters) long.

Flatworms have a flat, ribbon-, or leaf-shaped body. Roundworms have a long body that narrows at both ends. Earthworms, tube worms, and other segmented worms have a tubelike body divided into segments, or rings.

Many worms have sense organs…

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