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| Column-$I$ | Column-$II$ |
| $I$. Choanocytes | $p$. Cnidaria |
| $II$. Cnidoblasts | $q$. Platyhelminthes |
| $III$. Flame cells | $r$. Porifera |
| $s$. Aschelminthes |
| 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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