How many million tonnes of dry matter produced annually by photosynthesis?
A. 1700 million tonnes
B. 1900 million tonnes
C. 1400 million tonnes
D. 2000 million tonnes
Answer:A
How many million tonnes of dry matter produced annually by photosynthesis?
A. 1700 million tonnes B. 1900 million tonnes C. 1400 million tonnes D. 2000 million tonnes