Which one of the following are, correct characteristic, features set, for bony fishes?
1
Heterocercal caudal fin; 5 - 7 pairs of gill slits; exoskeleton is made up of cycloid scales.
2
Homocercal caudal fin; 4 pairs of gill slits, ventrally placed mouth
3
Homocercal caudal fin; 5 - 7 pairs of gill slits; presence of airbladder.
4
Homocercal caudal fin; 4 pairs of gill slits, presence of operculum.