41.Digestive system is incomplete in: A. Aschelminthes B. Hemichordata C. Ctenophora D. Mollusca
Option C. Ctenophora have incomplete digestive system.The distinguishing feature of the phylum is the presence of comb plates with cilia that are used for locomotion. They are radially symmetrical and diploblastic. The body of ctenophores is more complex than sponges but less complex compared to bilaterians. Like cnidarians, they also exhibit tissue level of organisation.
