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Extinction - Education | National Geographic Society However, during the history of life on Earth, there have been periods of mass extinction, when large percentages of the planet’s species became extinct in a relatively short amount of time These extinctions have had widely different causes About 541 million years ago, a great expansion occurred in the diversity of multicellular organisms
Polar Bear | Species | WWF - World Wildlife Fund Due to climate change the Arctic is heating up twice as fast as anywhere else on the planet, shrinking the Arctic sea ice cover by 14% per decade Compared to the median sea ice cover recorded between 1981-2010, we have lost about 770,000 square miles, an area larger than Alaska and California combined
The rate of species extinction in declining or fragmented . . . Loss of habitat can take many forms, ranging from the fragmentation of once-continuous habitat to the slow erosion of populations across continents Usually, the harm leading to biodiversity loss is not immediately obvious: there is an extinction debt Most modelling research of extinction debt has focussed on relatively rapid losses of habitat with species loss happening in response
Animals: News, feature and articles | Live Science We live on a planet with millions of species of animals -and a rich, diverse collection of known wildlife, and yet new species are being identified seemingly every day — both living and extinct