Please answer experts.....,,

Dear Student,

Ans. Option (4) has been incorrectly matched.
Carcharodon belongs to the taxon Chondrichthyes and not to Osteichthyes. 

Pisces can be divided into two classes: Class Chondrichthyes (cartilaginous fish) and Class Osteichthyes (bony fishes).

1. skins are covered with placoid scales
2. skeleton is cartilaginous
3. tail fins are asymmetrical
4. fertilization is internal
5. cold blooded
6. no external ears
7. operculum over gills are absent

1. Skins are covered with cycloid scales
2. Skeleton is bony
3. Tail fins are symmetrical
4. Operculum is present
5. No external ears
6. Cold blooded
7. Fertilization is external.