Which group of chordates possess sucking and circular mouth without jaws?
Cyclostomata. They are also known as the jawless fish.
What is the role of radula in molluscs?
Name the animal, which exhibits the phenomenon of bioluminescence. Mention the phylum to which it belongs.
What is the importance of pneumatic bones and air sacs in Aves?
Give one example each of an animal possessing placoid scales and that with cycloid scales.
