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Which one of the following exhibits conc...

Which one of the following exhibits concetric "tube within tube" plan

A

Arthropoda

B

Oligochaeta

C

Mollusca

D

Echinodermata

Text Solution

Verified by Experts

The correct Answer is:
B
The animal with this body plan posses a digestive canal having two openings at the end. The digestive canal is present inside the body cavity and hence the body plan is termed as tube within tube Ex : Annelida
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