Extinctions

  • Biological diversity has varied through 3 billion years
    of evolution

  • The Cambrian epoch (5 Mya) had the highest number
    of Phyla (highest taxa)

  • There have been so far 5 major extinction events

  • Highest number of speciesin life's history on earth
    is at Present

  • Extinction now 1,000 times its natural rate