Which one of the following exhibits a concent | vedclass

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(B) The "tube within a tube" body plan refers to an organism having a complete digestive tract with two openings (a mouth and an anus), where the inne

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Oligochaeta

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(B) The "tube within a tube" body plan refers to an organism having a complete digestive tract with two openings (a mouth and an anus), where the inner tube is the alimentary canal and the outer tube is the body wall.Annelids, including members of the class $Oligochaeta$ (such as earthworms), exhibit this body plan.They possess a true coelom, multicellularity, and bilateral symmetry, allowing for the separation of the digestive system from the body wall.

Which one of the following exhibits a concentric "tube within a tube" body plan?

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