| $(a)$ 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 |
| $(a)$ Operculum | $(viii)$ Osteichthyes |
| $(b)$ Parapodia | $(v)$ Annelida |
| $(c)$ Scales | $(iv)$ Reptilia |
| $(d)$ Comb plates | $(i)$ Ctenophora |
| $(e)$ Radula | $(ii)$ Mollusca |
| $(f)$ Hairs | $(vii)$ Mammalia |
| $(g)$ Choanocytes | $(iii)$ Porifera |
| $(h)$ Gill slits | $(vi)$ Cyclostomata and Chondrichthyes |
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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 $A$ | Column $B$ | Column $C$ |
| $(1)$ Planaria | $(a)$ Planula | $(e)$ Ostia |
| $(2)$ Hyalonema | $(b)$ Pseudocoelomate | $(f)$ Flame cells |
| $(3)$ Hydra | $(c)$ Platyhelminthes | $(g)$ Polyp |
| $(4)$ Wuchereria | $(d)$ Porifera | $(h)$ Aschelminthes |
| Column-$I$ | Column-$II$ |
| $I.$ Platyhelminthes | $p.$ Malpighian tubules |
| $II.$ Aschelminthes | $q.$ Renette cells |
| $III.$ Arthropoda | $r.$ Flame cells |
| $IV.$ Annelida | $s.$ Nephridia |
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