Biology 2 - Extinction and Specification

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Extinction and Specification

The fossil record contains many species that don't exist anymore - these species are said to be extinct.

Species become extinct for these reasons:

  • The environment changes too quickly
  • A new predator kills them all
  • A new disease kills them all
  • They can't compete with another (new) species for food
  • A castrophic event happens that kills them all (volcanic eruptions etc... etc...)
  • A new species develops


  • A species is a group of similar organisms that can reproduce to give fertile offspring
  • Specification is the development of a new species
  • Specification occurs when populations


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