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I think it is C an increase in acid rain my apologies if I am wrong
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The earliest known life-forms are putative fossilized microorganisms, found in hydrothermal vent precipitates, that may have lived as early as 4.28 Gya (billion years ago), relatively soon after the oceans formed 4.41 Gya, and not long after the formation of the Earth 4.54 Gya
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Because there was an argument on which was better, Capitalist and Communist. This problem lead into the Cold War.
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Do you mean Boaz? and the story from the bible? If so It is because he loves ruth.