Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in

Question

Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).

Options:

A . 1

B . 3

C . 7

D . 20

Answer: Option D
Answer: (d).20

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