MCQ
Characteristic features of cyclostomata are
- AElongated cylindrical body
- BRound mouth
- ✓Round mouth without jaws and paired appendages
- DRound mouth with jaw and unpaired appendages
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$CO _{2}+ H _{2} O \stackrel {A} {\rightleftharpoons} H _{2} CO _{3} \stackrel {B} {\rightleftharpoons} \rightleftharpoons HCO _{3}^{-}+ H ^{+}$