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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 |
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