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taskmasters
In this problem, we are taking our planet's age into account. (nearly 4.6 Billion Years Old) Unicellular forms of life started appearing on our planet nearly 3.8 Billion Years ago, before oxygen even started to appear.

So, (3.8 BY/4.6BY)*100 = The percentage would be 82.61%.

Hope this helped!


metchelle
Let us first consider the Earth's age as nearly 4.6 Billion Years (BY), instead of 13.7 BY from Big Bang, unicellular life appeared nearly 3.8 BY ago. This percentage is 3.8/4.6 X 100 = 82.6%, nearly. So the answer would be 82.6%. Hope this answer helps.
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