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The extinction symbol with an X-shaped pictogram of an hourglass.The letter X stands for the first syllable of the word "extinction" Flag with the extinction symbol. The extinction symbol represents the threat of holocene extinction on Earth; a circle represents the planet and a stylised hourglass is a warning that time is running out for many species.
English: The symbol represents extinction. The circle signifies the planet, while the hourglass inside serves as a warning that time is rapidly running out for many species. The circle signifies the planet, while the hourglass inside serves as a warning that time is rapidly running out for many species.
The extinction of a species was impossible under this model, as it would create gaps or missing links in the chain and destroy the natural order. [ 86 ] [ 87 ] Thomas Jefferson was a firm supporter of the great chain of being and an opponent of extinction, [ 86 ] [ 88 ] famously denying the extinction of the woolly mammoth on the grounds that ...
The quasi-extinction threshold, or sometimes called the quasi-extinction risk is the population size below which a species is considered to be at extreme risk of quasi-extinction. [5] This threshold varies by species and is influenced by several factors, including reproductive rates, habitat requirements, and genetic diversity.
Extinction: The Facts is a 2020 documentary film by the natural historian David Attenborough which aired on the BBC. It depicts the continuing sixth mass extinction, caused by humans, and the consequences of biodiversity loss and climate change. It also suggests positive action which can be taken to halt or reverse these effects.
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This article is a part of WikiProject Extinction, an attempt at creating a standardized, informative, comprehensive and easy-to-use resource on extinction and extinct organisms. If you would like to participate, you can choose to edit this article, or visit the project page for more information.
Many of the extinction events appear to be somewhat extended in time. In at least some cases this is the result of a paleontological artifact known as the Signor-Lipps effect (Signor & Lipps 1982). Briefly, this is the observation that inadequate sampling can cause a taxon to seem to disappear before its actual time of extinction.