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