One Important Difference Between the C, N, and S Cycles

Multiple Choice

One important difference between the C, N, and S cycles and the P, Ca, and Si cycles is that

A) P, Ca, and Si are NOT cycled in terrestrial environments.
B) the P, Ca, and Si cycles do NOT involve redox changes or gaseous forms that can alter Earthʹs atmospheric chemistry.
C) the P, Ca, and Si cycles do NOT involve microbial activity.
D) the P, Ca, and Si cycles are NOT affected by global warming or other human activity.