Give one example of (a) cartilaginous fish; (b) bony fish.

Name the superclass of Chordata in which lateral line sense organs are found.

Identify the following fishes:

(a) Fish with 5 to 7 pairs of gills; (b) Fish with air bladder.

Give the scientific name of the following :

(a) Mosquito fish; (b) Flying fish.

Why amphibians are present close to the water bodies?