| Column $X$ (Phylum) | Column $Y$ (Example) |
| $(1)$ Protozoa | $(P)$ Bath sponge |
| $(2)$ Coelenterata | $(Q)$ Liver fluke |
| $(3)$ Porifera | $(R)$ Jellyfish |
| $(4)$ Platyhelminthes | $(S)$ Opalina |
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| Column $-I$ | Column $-II$ |
| $(A)$ Porifera | $(i)$ Tornaria larva |
| $(B)$ Hemichordata | $(ii)$ Free-swimming larva |
| $(C)$ Cnidaria | $(iii)$ Parenchymula larva |
| $(D)$ Echinodermata | $(iv)$ Planula larva |
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