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| $a$. Cellular level of organisation | $1$. Cnidarians |
| $b$. Organ level of organisation | $2$. Platyhelminthes |
| $c$. Organ system level of organisation | $3$. Chordates |
| $d$. Tissue level of organisation | $4$. Porifera |
| Animals | Morphological features |
| $(i)$ Crocodile | $4$-chambered heart |
| $(ii)$ Sea urchin | Parapodia |
| $(iii)$ Obelia | Metagenesis |
| $(iv)$ Lemur | Thecodont |
| 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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