if the earth is 4.57 billion years old, and the oldest known life on earth is 3.4 billion years old, then for what percent of earth's history has life on earth existed

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29-11-2022
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if the earth is 4.57 billion years old, and the oldest known life on earth is 3.4 billion years old, then for what percent of earth's history has life on earth existed

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pratamafarhan pratamafarhan · Answer 1 · 2022-12-08T09:00:03+01:00

Taking Earth's age as nearly 4.57 Billion Years, instead of 13.7 billion years from Big Bang. The first unicellular life appeared nearly 3.77 billion years ago, not 3.4 billion years old. So the percentage of earth's history has life on earth existed is 3.77/4.57 X 100 = 82.5%, nearly.

What is the earliest known life forms on Earth?

The oldest known life forms on Earth are putative fossilized microorganisms found in hydrothermal vents, estimated to be about 3.42 billion years old. The earliest time for life to appear on Earth is at least 3.77 billion years ago, and possibly around 4.28 billion years ago, with the oceans forming 4.5 billion years ago and the Earth 4.57 billion years ago. Not long after it was formed before. The earliest direct evidence of life on Earth comes from microbial microfossils that infiltrated Australian apex chert rocks 3.465 billion years ago.

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