Living organisms have been on Earth for how much percent of Earth's history?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 80%.
Living organisms have been on Earth for approximately 80% of its history. Earth is about 4.5 billion years old, and the earliest evidence of life dates back to around 3.5 billion years ago. This means that life has existed for roughly 80% of the planet's history. The emergence of life early in Earth's history has played a crucial role in shaping the planet's environment and biological diversity.