GCSE Biology (AQA)

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Extinction

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Inheritance, Variation and Evolution The Development of Understanding of Gentics and Evolution

Extinction

4:02 Pressure on Organisms
Spec 4.6.3.6
Previous Natural Selection Next Mass Extinction
  • Extinction occurs when no individuals of a species remain alive.
  • The dodo is a well-known example of an extinct animal.
  • Species poorly adapted to their environment, particularly changing conditions, are less likely to survive and reproduce.
  • The Kakapo, a flightless bird in New Zealand, struggles with introduced predators like domestic cats, potentially leading to its extinction.
  • Human activities, including habitat destruction and introducing invasive species, significantly contribute to extinction.
  • Examples of human-induced extinctions include deforestation and the introduction of species like the red fox in Australia.
  • Other causes of extinction include new diseases and slow natural environmental changes, such as climate change.
  • Exam questions on extinction might involve analyzing the impact of human activities on specific species, like the pig footed bandicoot in Australia, which faced threats from habitat destruction, introduced species, and new diseases following European settlement.

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