The present level of carbon-dioxide in atmosphere is : (A)190 ppm (B) 295 – 300 ppm (C) 420 – 460 ppm (D) 490 ppm

The present level of carbon-dioxide
in atmosphere is :
(A)190 ppm (B) 295 – 300 ppm
(C) 420 – 460 ppm (D) 490 ppm
by

1 Answer

Answer :

(B) 295 – 300 ppm
by

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Description : Carbon dioxide concentration in atmosphere. -Biology

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