What percentage of the earths history have humans existed?
That depends on how long ago humans developed. Assume 100,000 years, the earth is about 4,000,000,000 years old. So % = 100,000 / 4,000,000,000 x 100 = 0.0025 %
What percentage of the earths history have humans existed?
That depends on how long ago humans developed. Assume 100,000 years, the earth is about 4,000,000,000 years old. So % = 100,000 / 4,000,000,000 x 100 = 0.0025 %
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