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The primary factor is that Earth is located in the "Habitable Zone," an area around our specific star in which life-supporting planets could develop. Habitable zones are different sizes and different distances for each star. This allowed a life-supporting atmosphere to develop (or at least, what would become one, as the atmosphere then was primarily sulfur and nitrogen gases), which caused rain, which formed oceans. The water reacted with the air and slowly, single-cell bacteria formed. Over billions of years, Earth went from molten to frozen to jungle and then began to stabilize, forming the diverse ecology seen today. Life adapted, and it's all evolution from there.

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