Bio-diversity and Evolution (page 1 and 2)

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  • Created by: Aishwarya
  • Created on: 27-04-12 06:19

Biodiversity - measure of the number of species on the planet.

Extinction - loss of species.

Human alteration to habitat is the single greatest threat to bio-diversity on Earth.

Species conservation - the planned preservation of wildlife.


  • process by which new species are formed from pre-existing ones over very long periods of time.
  • the theory of evolution was first put forward by Charles Darwin.
  • He proposed natural selection as the force that causes change in population.

Adaptive radiation in the finches of the Galapagos Islands

  • Darwin travelled to South America and the Galapagos Islands in 1832.
  • The islands were formed in recent geological time as a result of volcanic activity.
  • Task was to observe, describe and classify plants and animals.
  • He also collected fossils in rocks which showed him that different life-forms had gone through many changes in the past.
  • Studied 14 different species of finches
  • Finches may have reached the


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