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| Column-$I$ | Column-$II$ |
| $(a)$ Amphibia | $(1)$ Air bladder |
| $(b)$ Mammalia | $(2)$ Cartilaginous notochord |
| $(c)$ Chondrichthyes | $(3)$ Mammary gland |
| $(d)$ Osteichthyes | $(4)$ Pneumatic bones |
| $(e)$ Cyclostomata | $(5)$ Dual habitat |
| $(f)$ Aves | $(6)$ Jawless,circular,sucking mouth |
| 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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