Question : Living organisms have been on Earth for how much per cent of Earth's history?
Option 1: 80%
Option 2: 20%
Option 3: 60%
Option 4: 40%
Correct Answer: 80%
Solution : The correct option is 80%.
Earth is estimated to be around 4.54 billion years old. The earliest evidence of life on Earth comes from fossilized microorganisms, which are 3.5 billion years old. Therefore, living organisms have been present on Earth for a significant portion of its history—around 80% of the time since the planet's formation.
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