Theory of Island Biogeography is possibly the most significant contribution towards the scientific understanding of both the process and how to measure the rate of species extinction. The current background extinction rate is estimated to be one species every few years.The measure of ongoing species loss is made more complex by the fact that most of the Earth's species have not been described or evaluated. The estimates vary greatly on how many species actually exist (matched range: 3,600,000-111,700,000) to how many have received an actual species (matched range: 1.5-8 million vertebrates). Theory of Island Biogeography is possibly the most significant contribution towards the scientific understanding of both the process and how to measure the rate of species extinction. The current background extinction rate is estimated to be one species every few years.The measure of ongoing species loss is made more complex by the fact that most of the Earth's species have not been described or evaluated. The estimates vary greatly on how many species actually exist (matched range: 3,600,000-111,700,000) to how many have received an actual species (matched range: binomial vertebrates). The The The The The
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