Extinction (AQA GCSE Biology: Combined Science)

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Extinctions

  • Extinctions occur when there are no remaining individuals of a species still alive
  • Species that are poorly adapted to their environment are less likely to survive and reproduce compared to species that are well adapted to their environment
  • If they are unable to survive and reproduce sufficiently to maintain their population numbers they will eventually go extinct
  • Some factors which may contribute to the extinction of a species include:

Factors that can lead to extinction table

Factors that can lead to extinction table, downloadable IGCSE & GCSE Biology revision notes

Examiner Tip

Extinction is occurring all the time. Although it is happening naturally for many of the reasons in the table above, human activities have also massively increased extinction rates in recent history.We are very successful predators and have hunted many species to extinction (eg. the dodo). We also compete very effectively against other species for resources such as space, food and water.

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Lára

Author: Lára

Expertise: Biology Lead

Lára graduated from Oxford University in Biological Sciences and has now been a science tutor working in the UK for several years. Lára has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning.