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Which one of the following compounds hel...

Which one of the following compounds helps in achieving equilibrium between `O_2` and `CO_2` in atmosphere? Chlorophyll, Vitamin-B`_(12)`, Porphyrin, Acetyl salicylic acid

A

Chlorophyll

B

Vitamin-B '_(12)'

C

Porphyrin

D

Acetyl salicylic acid

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A
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