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Gardeners prize earthworms because they devour organic matter and excrete worm castings, richer in important nutrients than the best topsoil, and beneficial bacteria in the worm destroy harmful bacteria such as e. coli and salmonella. Earthworm tunnels improve soil aeration and drainage. Biology teachers prize earthworms for the lessons they can teach. Lacking legs, faces and skeletons, earthworm anatomy is still well designed to perform for the worm the same basic functions human bodies do.
An area of land may look like nothing more than a big plot of grass, but a few feet under the soil, the world is alive. Along with bugs and ants, millions of earthworms are burrowing their way through the dirt, looking for moist areas to breathe and live. Other than an earthworm's slimy texture, people may not know a lot about them.