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179 min · 180 marks · Full test mode with leaderboard
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| Column - I | Column - II |
|---|---|
| (a) 6 - 15 pairs of gill slits | (i) Trygon |
| (b) Heterocercal caudal fin | (ii) Cyclostomes |
| (c) Air Bladder | (iii) Chondrichthyes |
| (d) Poison sting | (iv) Osteichthyes |
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