Which of the following is an example of a local biogeochemical ...

[penza]

Which of the following is an example of a local biogeochemical cycle?
A) O2 released by oak trees in a forest
B) CO2 absorbed by phytoplankton in the open ocean
C) excess NO3- converted to N2 by denitrifying soil bacteria
D) phosphorous being absorbed from the soil by a corn plant
E) organic carbon remains of a leaf being converted to CO2 by a fungus

[plus1]

I recall doing this last year, it's D, bye bye!

[penza]

Incredible, thanks for your help!