Worldwide, how much atmospheric carbon dioxide is fixed into organic compounds annually?

Question

Which one?

A. 70 million metric tons

B. 10 million metric tons

C. 10 thousand metric tons

D. 10 billion metric tons

E. 70 billion metric tons

AP Bio help...I read the chapter and searched the web for the answer, but can't find it.

Answer 1

They say 1.2x10 to the 12th power pounds. I believe that comes closest to D. 10 billion metric tons.

http://www.biologie.uni-hamburg.de/b-onl...