Question
Match the following columns and select the correct option :
| Column-I | Column-II |
|---|---|
| (a) 6-15 pairs of gill slits | (i) Trygon |
| (b) Heterocercal | (ii) Cyclostomes |
| (c) Air Bladder | (iii) Chondrichthyes |
| (d) Poison sting | (iv) Osteichthyes |