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Extinction - PowerPoint PPT Presentation


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Extinction. Extinction. The result of animals or plants being unable to adapt to changing conditions . is the process in which groups of organisms (species) die out. Mass Extinctions. rapid events during which a significant part of all life on Earth becomes extinct

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extinction1
Extinction
  • The result of animals or plants being unable to adapt to changing conditions.
  • is the process in which groups of organisms (species) die out.
mass extinctions
Mass Extinctions
  • rapid events during which a significant part of all life on Earth becomes extinct
  • the life forms that become extinct must have belong to different phyla, live in different habitats, spread out over the world.
causes of mass extinctions
Causes of Mass Extinctions
  • Catastrophic Agents-meteorite impacts and comet showers,
  • Earth Agents- volcanism, glaciation, variations in sea level, global climatic changes, and changes in ocean levels of oxygen or salinity
major extinctions
Major Extinctions
  • Ordovician–Silurian event 440–450 Mya
  • Late Devonian – 360–375 Mya
  • Permian–Triassic event– 251 Mya
  • Triassic–Jurassic event – 205 Mya
  • Cretaceous–Tertiary event 65. Mya
  • Holocene- Today!!!!!