Earth s history
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Earth’s History. The Earth formed from a mass of dust and gas about ____ years ago. 4.6 billion years ago. The earliest life forms were probably similar to present day ________. Bacteria. Paleontologists call the beginning of the Paleozoic era the “Cambrian Explosion” because.

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Earth’s History

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Earth s history

Earth’s History


Earth s history

  • The Earth formed from a mass of dust and gas about ____ years ago.


Earth s history

  • 4.6 billion years ago


Earth s history

  • The earliest life forms were probably similar to present day ________.


Earth s history

  • Bacteria.


Earth s history

  • Paleontologists call the beginning of the Paleozoic era the “Cambrian Explosion” because


Earth s history

  • So many life forms appeared within a relatively short period of time


Earth s history

  • The first vertebrates were


Earth s history

  • Jawless fish


Earth s history

  • The first vertebrate to crawl onto land was the


Earth s history

  • lungfish


Earth s history

  • An amphibian is an animal that


Earth s history

  • Lives part of its life on land and part of its life in water


Earth s history

  • At the end of the Paleozoic there was a mass extinction. __________ of life in the oceans disappeared. (Give your answer as a percentage)


Earth s history

  • 95%


Earth s history

  • The Mesozoic Era is known as the “Age of ________”


Earth s history

  • Age of Reptiles or Age of Dinosaurs


Earth s history

  • Birds first appeared during the _________ period.


Earth s history

  • Jurassic


Earth s history

  • About ________ years ago at the end of the Cretaceous Period, a mass extinction occurred.


Earth s history

  • 65 million years ago


Earth s history

  • The extinction of the dinosaurs created an opportunity for ___________


Earth s history

  • mammals


Earth s history

  • The fossil record suggests that human ancestors appeared about _______ years ago.


Earth s history

  • 3.5 million


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