Answer:
The answer is oil .
Explanation:
<u>Oil</u> is not a natural Earth cycle.
(Correct me if I am wrong)
A) One species always outcompetes the other until only one species remains.
Biotic Factors are any living components that affect other organisms, and since soil is not alive (soil is an abiotic factor) then you can eliminate A., B., and C. D is the answer choice that has only biotic examples.
