MCQ
The body of hemichordates is divided into
- AHead, muscular foot and visceral hump
- BHead, thorax and abdomen
- ✓Proboscis, collar and trunk
- DProboscis and trunk
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$CO _{2}+ H _{2} O \stackrel {A} {\rightleftharpoons} H _{2} CO _{3} \stackrel {B} {\rightleftharpoons} \rightleftharpoons HCO _{3}^{-}+ H ^{+}$