In the beginning, the Earths composition was real different that how it exists today. A big time a go the Earths atmosphere was very similar to todays genus Venus and Mars atmosphere. It had about 95% hundred dioxide, 2-3% nitrogen, and very little, less than 1% oxygen. Today the Earth contains 79% nitrogen, 21% oxygen, and 3% piddle vapor. It is evident that there were some events that happened over billions of years that have...If you trust to get a replete(p) essay, order it on our website: OrderEssay.net
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