Humans affect the phosphorus cycle mainly by the use of fertilizers and raising livestock, especially hogs. Fertilizers and hog waste are high in phosphorus, which makes its way into the soil (where it is necessary in moderate amounts) and, due to runoff, in water.Apr 27, 2012
Answer:
to learn about its history/formation
Explanation:
This is true, Darwin spent over 20 years developing his theory of natural selection
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