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The Origins of Life on Earth
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The Origins of Life on Earth

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Questions and Answers

When did the earliest direct evidence of life on Earth appear?

  • 4.54 billion years ago
  • 4.5 billion years ago
  • 3.465 billion years ago (correct)
  • 3.42 billion years ago

    • How old are the fossilized microorganisms found in hydrothermal vent precipitates believed to be?

  • 4.5 billion years old
  • 4.28 billion years old
  • 3.77 billion years old
  • 3.42 billion years old (correct)

    • When did the origin of life on Earth possibly occur?

  • 3.77 billion years ago
  • 3.42 billion years ago
  • 4.28–4.45 billion years ago (correct)
  • 4.54 billion years ago

    • How far does the Earth's biosphere extend into the atmosphere?

    <p>At least 76 km (47 mi)</p> Signup and view all the answers

    Where is the earliest known life in the universe found?

    <p>Earth</p> Signup and view all the answers

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