<span>As of 2016, farm and ranch families made up only two percent of the total US population. The amount of farmer and ranching families has declined at a fast pace since it's peak in 1935. In the last twenty years most of the decline can be blamed on how little farmers and ranchers make from the food they grow or raise. Farmers and ranchers only receive, on average, sixteen cents for every dollar that is spent on food in both grocery stores, down from about thirty-one cents for every dollar in the 1980's.</span>
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Explanation:
Oxygen is of no use to them, so they release it into the air. So there's a simple explanation for the Great Oxidation Event. It was the cyanobacteria, pumping out unwanted oxygen, that transformed Earth's atmosphere.
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changes in the earth are similar to the changes of human beings because it evolves at the same time and humans evolve the earth, without it the earth may never change and it will collapse.