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

Gap-fill exercise

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In these beings are a longitudinal
layer under the and,
internally juxtaposed perpendicular
to it, circular (radial to axis)
muscular layer. circular muscle
layer the function of the
body while longitudinal shortens it.
alternating actions both
movement.