Biodiversity is the variation of life forms within a given ecosystem, biome, or for the entire Earth. The biodiversity found on Earth today consists of many millions of distinct biological species, which is the product of nearly 3.5 billion years of evolution.
- ^ Chapman, A.D. (September 2005). "Numbers of Living Species in Australia and the World". Australian Biological Resources Study. http://www.environment.gov.au/biodiversity/abrs/publications/other/species-numbers/01-introduction.html. Retrieved on 2009-04-23.
- ^ "Determing the genomic infrastructure of evolution and diversity through comparative genome analysis". National Institute of Informatics. 2009. http://www.nii.ac.jp/index.php?action=pages_view_main&page_id=495&lang=english. Retrieved on 2009-04-23.