B2 6.4 Isolation and the evolution of new species

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  • New species can arise from existing species if a group becomes isolated from the rest.
  • Geographical isolation could occur if an island separates from the mainland or if a new river separates two areas. Mountain ranges and old craters can isolate organisms.
  • The organisms left on the island may be exposed to different environmental conditions, food availability or predators. Natural selectionn will occur in both areas, but different characteristics will be beneficial in…


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