Geologic Time Scale Overview
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Questions and Answers

Which group of organisms was the main life-form during most of Earth's early history?

  • Algae and bacteria (correct)
  • Land plants and fish
  • Complex organisms
  • Humans

    • When did humans first appear on Earth based on the information provided?

  • 550 million years ago
  • 200,000 years ago (correct)
  • 500 million years ago
  • 3.5 billion years ago

    • What is a mass extinction?

  • When a new species evolves
  • The permanent dying out of a species or a larger group of organisms (correct)
  • When Earth formed
  • When large numbers of species adapt to new environments

    • Which geologic time unit is the longest?

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

    What marks the beginning of the Phanerozoic eon?

    <p>Variety of life-forms suddenly increased</p> Signup and view all the answers

    What event could potentially cause a mass extinction, such as the one that led to the extinction of dinosaurs?

    <p>Asteroid or comet impact</p> Signup and view all the answers

    What division of geologic time comes after the Proterozoic Eon?

    <p>Phanerozoic Eon</p> Signup and view all the answers

    Which era is considered the oldest in the Phanerozoic Eon?

    <p>Paleozoic era</p> Signup and view all the answers

    What major event marks the beginning of the Cambrian period within the Paleozoic era?

    <p>Cambrian explosion</p> Signup and view all the answers

    Why do scientists have more knowledge about the Cenozoic era compared to earlier periods?

    <p>More fossils discovered</p> Signup and view all the answers

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