एक नर एस्केरिस (Ascaris) में केवल एक ही वृषण (testis) होता है। इस स्थिति को क्या कहा जाता है?

Select the incorrect statements from the following: A. Digestive system in Platyhelminthes is incomplete. B. Bilateral symmetry is a characteristic feature of adult Echinoderms. C. Pseudocoelom is possessed by Aschelminthes. D. Notochord is persistent throughout life in the class Chondrichthyes. E. Members of class Reptilia maintain a constant body temperature. Choose the correct answer from the options given below:

Select the set of fishes that belong to the class Osteichthyes: