Name those phyla in which circulatory system is open and body cavity is filled with blood.
Mollusca and Arthropoda.
Question 47 Give examples for the following (a) Bilateral, dorsiventral symmetry is found in___. (b) Worms causing disease elephantiasis is ___. (c) Open circulatory system is found in ___ where coelomic cavity is filled with blood. (d) ___are known to have pseudocoelom.