Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds __________ percent (by volume). (A) 1(B) 3 (C) 7 (D) 20

Acute danger to human life (i.e. death) exists, if the concentration of
CO2
in atmospheric air exceeds __________ percent (by volume).
(A) 1
(B) 3
(C) 7
(D) 20
by

1 Answer

Answer :

(D) 20
by

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