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History of Life on Earth

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  • What era consisted of a series of Ice ages?
    Cenozoic Era
  • What events happened during the Mesozoic Era?
    Continents drifted apart, Meteorite caused mass extinction, small mammals appeared.
  • What is older, ammonites or trilobites?
    Trilobites
  • How long ago did first humans appear?
    2 million years ago.
  • The First reptiles appeared during this era.
    Paleozoic Era
  • Formation of the Earth and Moon would be which page in the book of History of Life on Earth.
    Page 1
  • Cenozoic era saw the existence of what organisms?
    Flowering Plants, Mammals, birds, and fish
  • Older rock layers are at the ______________, while newer rock layers are at the________________.
    Bottom, Top.
  • During what era were there dangerous thunderstorms and violent volcanoes? It is the first era.
    Precambrian Era
  • When did the first organisms appear on Earth?
    3.8 billion years ago
  • Mesozoic era saw the existence of what organisms?
    Dinosaurs, cycads, ferns and conifers.
  • Non-flowering plants started to grow in this era.
    Paleozoic Era
  • The continents drifted together during this era.
    Paleozoic Era.
  • What happened at the end of each geologic era?
    A mass extinction
  • How old is the Earth?
    4.6 Billion years old
  • Prokaryotes appeared in this era.
    Precambrian Era
  • This single cell organism came into existence during the Precambrian Era and began photosynthesis.
    Cyanobacteria
  • The Precambrian Era say the start of the production of this important gas. We breath it.
    Oxygen
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