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

question 69

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.

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