MCQ
Chose the correct pair :
- AOpen circulatory system - Annelida
- BClose circulatory system - Protists
- ✓Open circulatory system - Hemi chordata
- DClose circulatory system - Arthropods
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$CO _{2}+ H _{2} O \stackrel {A} {\rightleftharpoons} H _{2} CO _{3} \stackrel {B} {\rightleftharpoons} \rightleftharpoons HCO _{3}^{-}+ H ^{+}$