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| $(a)$ Operculum | $(i)$ Ctenophora |
| $(b)$ Parapodia | $(ii)$ Mollusca |
| $(c)$ Scales | $(iii)$ Porifera |
| $(d)$ Comb plates | $(iv)$ Reptilia |
| $(e)$ Radula | $(v)$ Annelida |
| $(f)$ Hairs | $(vi)$ Cyclostomata and Chondrichthyes |
| $(g)$ Choanocytes | $(vii)$ Mammalia |
| $(h)$ Gill slits | $(viii)$ Osteichthyes |
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