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| Animals | Morphological features |
| $(i)$ Crocodile | $4$-chambered heart |
| $(ii)$ Sea urchin | Parapodia |
| $(iii)$ Obelia | Metagenesis |
| $(iv)$ Lemur | Thecodont |
| List $I$ | List $II$ |
| $A$. Pterophyllum | $I$. Hag fish |
| $B$. Myxine | $II$. Saw fish |
| $C$. Pristis | $III$. Angel fish |
| $D$. Exocoetus | $IV$. Flying fish |
| 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 |
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