BIOXI04: ANIMAL KINGDOM
332480
Which of the following is a characteristic feature of osteichthyes?
1 Internal fertilisation
2 Gills are covered by an operculum on each side
3 Pelvic fins of bear claspers
4 Viviparous
Explanation:
Osteichthyes have four pairs of gills which are covered by an operculum on each side.