How long has life existed on earth?
3.5 billion years
The oldest known fossils date back approximately 3.5 billion years, but some scientists have found chemical evidence that points to an even earlier beginning for life—nearly 4 billion years ago—despite the fact that the earth is only 4.55 billion years old (Reference: pbs. https://tutor.hix.ai)
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It is estimated that life has existed on Earth for 3.5–3.8 billion years.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
- What role does radioactivity play in the formation of our solar system?
- How is the theory of plate tectonics related to the formation and breakup of pangaea?
- Why did life begin on earth using an anaerobic mode of metabolism?
- How far is Saturn from Earth?
- When will Earth's core die out? Will it die out when the sun dies out because it gets heat from the sun?
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