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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 |
| List-$I$ | List-$II$ |
|---|---|
| $(a)$ Physalia | $(i)$ Pearl oyster |
| $(b)$ Limulus | $(ii)$ Portuguese Man of War |
| $(c)$ Ancylostoma | $(iii)$ Living fossil |
| $(d)$ Pinctada | $(iv)$ Hookworm |
| Column $-I$ | Column $-II$ |
| $(A)$ Cartilaginous fishes | $(i)$ Cycloid scales |
| $(B)$ Bony fishes | $(ii)$ Epidermal scales |
| $(C)$ Reptiles | $(iii)$ Placoid scales |
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