Match the following columns:
Column-$I$ Column-$II$ $I.$ Skin without scales $p.$ $Catla$ $II.$ Placoid scales $q.$ $Hagfish$ $III.$ Cycloid scales $r.$ $Chameleon$ $IV.$ Epidermal scales $s.$ $Ray-fish$
| Column-$I$ | Column-$II$ |
| $I.$ Skin without scales | $p.$ $Catla$ |
| $II.$ Placoid scales | $q.$ $Hagfish$ |
| $III.$ Cycloid scales | $r.$ $Chameleon$ |
| $IV.$ Epidermal scales | $s.$ $Ray-fish$ |
- A$I-q, II-s, III-p, IV-r$
- B$I-r, II-s, III-p, IV-q$
- C$I-r, II-p, III-s, IV-q$
- D$I-q, II-p, III-s, IV-r$
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Which of the following phyla is correctly matched with its two general characteristics?
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| Column-$I$ | Column-$II$ |
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|---|---|---|---|
| Arthropoda | $...............$ | $...............$ | Lungs/Gills/Tracheal system |
| $...............$ | Nephridia | Closed | Skin/Parapodia |
| $...............$ | Metanephridia | Open | $...............$ |
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