Which one of the following exhibits a concent | vedclass

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(B) In $Annelida$,the alimentary canal is a straight tube extending from the anterior mouth to the posterior anus.Because they possess a true coelom (

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Annelida

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(B) In $Annelida$,the alimentary canal is a straight tube extending from the anterior mouth to the posterior anus.Because they possess a true coelom (a fluid-filled body cavity) between the body wall and the alimentary canal,their body structure is described as a '$tube\; within\; a\; tube$' plan.This indicates a complete digestive system with two separate openings.

Which one of the following exhibits a concentric '$tube\; within\; tube$' body plan?

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