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Which one of the following exhibits concentric tube within tube plan ?A. CnidariaB. AnnelidaC. PlatyhelminthesD. Nematoda

Answer» Correct Answer - B
In annelids , alimentary canal is straight with anterior mouth and posterior anus . Due to spacious , fluid-filled body cavity between body wall and alimentary canal , the body appears like a tube within a tube in section .


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