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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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A
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The u.s troop numbers peaked in 1969 with president Johnson who approved an increased maximum number of U.S troops to 549,500.