Q. Which of the following animals have tube within tube body plan evolved along deuterostomic evolutionary line?
A. Annelids
B. Arthropods
C. Echinoderms
D. Molluscs
Answer: Echinoderms
A. Annelids
B. Arthropods
C. Echinoderms
D. Molluscs
Answer: Echinoderms
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