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The body wall in arrow worms is a stratified layer composed of what?

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Final answer:

The body wall in arrow worms is composed of two layers of muscle - circular and longitudinal. Flatworms have a similar structure, but with a single layer of cells or fused cells.

Step-by-step explanation:

The body wall in arrow worms is a stratified layer composed of two layers of muscle - one circular and the other longitudinal. The mesodermal tissues include support cells and secretory cells that secrete mucus and other materials to the surface. Flatworms, on the other hand, have a single layer of cells or a layer of fused cells covering a layer of circular muscle above a layer of longitudinal muscle.

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