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Biodiversity or Biological diversity is a term that describes the variety of living beings on earth. In short, it is described as degree of variation of life. Biological diversity encompasses microorganism, plants, animals and ecosystems such as coral reefs, forests, rainforests, deserts etc. Biodiversity also refers to the number, or abundance of different species living within a particular region.
, US environment correspondent. Tuesday 23 August 2011 17.00 EDT First published on Tuesday 23 August 2011 17.00 EDT. Humans share the planet with as many as 8.7 million different forms of life, according to what is being billed as the most accurate estimate yet of life on Earth. Researchers who have analysed the hierarchical categorisation of life on Earth to estimate how many undiscovered species exist say the diversity of life is not equally divided between land and ocean. Three-quarters of the 8.7m species â the majority of which are insects â are on land; only one-quarter, 2.2m, are in the deep, even though 70% of the Earth's surface is water.