Question

Earth is approximately 4.54 * 10^9 years old. Humans are thought to have evolved around 2.5 * 10^5 years ago.

For what percentage of the age of the Earth have humans been present? Give your answer to 3 s.f

Answer 1

5.507*10^-7%

Explanation:

(2.5 * 10^5)/(4.54 * 10^9)*1/100 %= 5.507*10^-7%