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| $(a)$ $6-15$ pairs of gill slits | $(i)$ $Trygon$ |
| $(b)$ Heterocercal caudal fin | $(ii)$ $Petromyzon$ |
| $(c)$ Air bladder | $(iii)$ $Chondrichthyes$ |
| $(d)$ Poison sting | $(iv)$ $Osteichthyes$ |
| Column $X$ | Column $Y$ |
| $(1)$ Skin without scales | $(P)$ Catla |
| $(2)$ Placoid scales | $(Q)$ Hagfish |
| $(3)$ Cycloid scales | $(R)$ Chameleon |
| $(4)$ Epidermal scales | $(S)$ Ray-fish |
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