Which one of the following exhibits concentric 'tube within tube' plan ?

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

Which one exhibits concentric tube-within-tube plan ?

Which of the following has pseudocoelomate tube within a tube body plan

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

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

Which one forms the pollen tube

Which one forms the pollen tube

Which of the following phylum have "Tube within tube" body plan?

Which of the following animals has tube- within-tube type of body plan evolved along deuterostomic evolutionary line ?

Which of the following animals has tube- within-tube type of body plan evolved along deuterostomic evolutionary line ?