How can the presence, localization and function of muscular tissue in beings of the phylum Annelida be explained?

How can the presence, localization and function of muscular tissue in beings of the phylum Annelida be explained?
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In these beings there are a longitudinal muscular layer under the epidermis and, internally juxtaposed and perpendicular to it, another circular (radial to the axis) muscular layer. The circular muscle layer has the function of elongating the body while the longitudinal shortens it. By alternating actions both promote movement.
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