Origin of Life on Earth and Evolution
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Questions and Answers

What is the estimated time of formation of Earth and the other planets in the solar system?

  • 4.6 billion years ago (correct)
  • 5.5 billion years ago
  • 3.5 billion years ago
  • 2.5 billion years ago

    • What likely occurred to the water vapour in the first atmosphere as Earth cooled down?

  • It turned into a thick fog
  • It condensed into the ocean (correct)
  • It disappeared into space
  • It turned into a solid

    • What is believed to have favoured the synthesis of organic molecules essential for the origin of life?

  • Only the Earth's reducing atmosphere
  • Only volcanic eruptions and lightning
  • Volcanic eruptions, lightning, extreme UV radiation, hydrothermal vents, and alkaline vents along with the Earth's reducing atmosphere (correct)
  • Only extreme UV radiation and hydrothermal vents

    • What is the approximate age of the fossils of micro-organisms that provide direct evidence for life on early Earth?

    <p>3.5 billion years old</p> Signup and view all the answers

    What was the characteristic of the first atmosphere on Earth?

    <p>It had little oxygen</p> Signup and view all the answers

    What is the process by which simple organic molecules formed macromolecules such as proteins and nucleic acids?

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

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