Which one exhibits concentric tube-withi...

Which one exhibits concentric tube-within-tube plan ?
(a) Arthropoda
(b) Oligochaeta /Earthworm
(c) Mollusca
(d) Echinodermata

A

Arthropoda

B

Oligochaeta /Earthworm

C

Mollusca

D

Echinodermata

Verified by Experts

The correct Answer is:

B

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