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• extinction (biology) - Hutchinson encyclopedia article about ...

  In biology, the complete disappearance of a species from the planet. Extinctions occur when a species becomes unfit for survival in its natural habitat usually to be replaced by ...

• Extinction (biology) - MSN Encarta

  Extinction biology, the end of existence of a group of organisms, caused by their inability to adapt to changing environmental conditions. The...

• Extinction (biology) definition of Extinction (biology) in the Free ...

  extinction, in biology, disappearance of species of living organisms. Extinction occurs as a result of changed conditions to which the species is not suited.