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| Column-$I$ (Organisms) | Column-$II$ (Common name) |
| $A$. Pennatula | $i$. Sea-fan |
| $B$. Gorgonia | $ii$. Sea-pen |
| $C$. Adamsia | $iii$. Sea-Anemone |
| $D$. Cucumaria | $iv$. Sea-cucumber |
| Column-$I$ | Column-$II$ |
| $I.$ Hepatopancreas | $p.$ Mollusca |
| $II.$ Digestive tract with digestive glands | $q.$ Arthropoda |
| $III.$ Digestive tube straight or coiled | $r.$ Hemichordata |
| $IV.$ Straight or $U$-shaped digestive tract | $s.$ Echinodermata |
| 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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