Concerning Biogeochemical Cycles, All of the Following Are True EXCEPT

Concerning biogeochemical cycles, all of the following are true EXCEPT:

A) nearly half of nitrogen in the biosphere comes from anthropogenic sources
B) carbon dioxide production by human industry has outpaced fixation
C) most microbes can interconvert the six major elements, from one to another
D) organisms acquire elements from abiotic sources or from other organisms
E) biogeochemistry is the metabolic interactions of microbes with biotic and abiotic environs