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| Column-$I$ | Column-$II$ |
|---|---|
| $(a)$ Gregarious pest | $(i)$ Asterias |
| $(b)$ Radial symmetry in adults and bilateral symmetry in larvae | $(ii)$ Scorpion |
| $(c)$ Book lungs | $(iii)$ Ctenoplana |
| $(d)$ Bioluminescence | $(iv)$ Locusta |
| Characteristic | Cyclostomata | Chondrichthyes | Osteichthyes |
| $(i)$ Habitat | Marine | Marine | Marine,Fresh Water |
| (ii) Mouth | Sucking mouth | Ventral mouth | Terminal mouth |
| (iii) Gill Slits | $6-15$ Pairs | $5-7$ Pairs | $4$ Pairs |
| (iv) Scales | Absent | Placoid | Cycloid/Ctenoid |
| $(v)$ Fins | Unpaired | Paired | Paired |
| Animals | Morphological features |
| $(i)$ Crocodile | $4$-chambered heart |
| $(ii)$ Sea urchin | Parapodia |
| $(iii)$ Obelia | Metagenesis |
| $(iv)$ Lemur | Thecodont |
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