The term worm is used to describe many different cylindrical and legless animals.
They often have a cylindrical, flattened or leafy body shape, and in most cases they have not got any limbs. Instead, they have bristles or fins that allow them to move. Their size varies from 1 millimeter even up to 100 feet which makes them very interesting. On the following pictures we can see some of these "long" worms...
images source: rgbpicture.com
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