What amount of carbon is fixed in the biosphere through photosynthesis annually?
A. 1013 kg
B. 20 × 1020 kg
C. 4 × 1013 kg
D. 80 × 1035 kg
Answer:C
What amount of carbon is fixed in the biosphere through photosynthesis annually?
A. 1013 kg B. 20 × 1020 kg C. 4 × 1013 kg D. 80 × 1035 kg