MCQ
Element necessary for the middle lamella.
- ✓$Ca$
- B$Zn$
- C$K$
- D$Cu$
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$CO _{2}+ H _{2} O \stackrel {A} {\rightleftharpoons} H _{2} CO _{3} \stackrel {B} {\rightleftharpoons} \rightleftharpoons HCO _{3}^{-}+ H ^{+}$