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| Column $X$ | Column $Y$ |
| $(1)$ Aves | $(A)$ Endoskeleton made of cartilage |
| $(2)$ Amphibia | $(B)$ Left aortic arch |
| $(3)$ Chondrichthyes | $(C)$ First homeothermic animals |
| $(4)$ Mammalia | $(D)$ Metamorphosis |
| Column $X$ | Column $Y$ |
| $(1)$ Platyhelminthes | $(P)$ Malpighian tubules |
| $(2)$ Aschelminthes | $(Q)$ Nephridia |
| $(3)$ Arthropoda | $(R)$ Flame cells |
| $(4)$ Annelida | $(S)$ Renette cells |
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