Differentiate between
Chondrichthyes and Osteichthyes
| Chondrichthyes | Osteichthyes |
| They have cartiligionous endoskeleton | They have bony endoskeleton |
| They have placoid scales | They have cycloid scales |
| e.g Scoliodon | e.g Rohu |
Mention two similarities between
a. Aves and mammals
b. Frog and crocodile
c. Turtle and pila
