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