Choose the correct difference between $Pristis$ and $Catla$.
- A$3$-chambered heart $-$ $2$-chambered heart
- BSmall placoid scales $-$ Large placoid scales
- CVentral mouth $-$ Terminal mouth
- DSwim bladder present $-$ Swim bladder absent
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| $(ii)$ Sea urchin | Parapodia |
| $(iii)$ Obelia | Metagenesis |
| $(iv)$ Lemur | Thecodont |
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