वे जीव जिनके शरीर को केवल एक ही समतल से दो समान दाएं और बाएं भागों में विभाजित किया जा सकता है, वे किस प्रकार की सममिति प्रदर्शित करते हैं?

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:

The flightless bird with forelimbs modified into paddle-like structures suited for swimming is known as:

A group of researchers observed the following characters in a fish-like animal: A. Endoskeleton made of cartilage. B. Ectoparasitic, attached to fish skin with a circular sucking mouth. C. Paired fins and scales were absent, but gill slits were present. Which of the following animals fits best with these characters?

Euplectella belongs to which phylum/group of the animal kingdom?

Which of the following organisms belongs to Phylum Hemichordata and exhibits a stomochord (rudimentary structure similar to a notochord)?

In which subphylum of chordates is the notochord present only in the tail region of the larval stage?

How does the notochord differ between Urochordata and Cephalochordata?