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en.wikipedia.org/wiki/Background_extinction_rate

Background extinction rate, also known as the normal extinction rate, refers to the standard rate of extinction in earth's geological and biological history before ...

study.com/academy/lesson/what-is-extinction-defining-background-and-mass-extinction.html

In this lesson you'll discover what the term 'extinction' means as well as learn the two different types of extinction: mass extinction and...

www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html

Is the biosphere today on the verge of anything like the mass extinctions of the ... Given the average species lifespan for mammals, the background extinction ...

www.ncbi.nlm.nih.gov/pubmed/25159086

Conserv Biol. 2015 Apr;29(2):452-62. doi: 10.1111/cobi.12380. Epub 2014 Aug 26. Estimating the normal background rate of species extinction. De Vos JM(1), ...

www.biologicaldiversity.org/programs/biodiversity/elements_of_biodiversity/extinction_crisis

Although extinction is a natural phenomenon, it occurs at a natural “background” rate of about one to five species per year. Scientists estimate we're now losing ...

www.differencebetween.com/difference-between-mass-extinction-and-vs-background-extinction

Sep 3, 2014 ... What is the difference between mass extinction and background extinction - Background extinction usually affects only one species at a time.

www.thefreedictionary.com/background+extinction

The ongoing low-level extinction of individual species over very long periods of time due to naturally occurring environmental or ecological factors such as ...

www.britannica.com/science/conservation-ecology/Calculating-background-extinction-rates

conservation - Calculating background extinction rates: To discern the effect of modern human activity on the loss of species requires determining how fast ...

www.yourdictionary.com/background-extinction

The ongoing low-level extinction of individual species over very long periods of time due to naturally occurring environmental or ecological factors such as ...

labs.russell.wisc.edu/peery/files/2011/12/7.-Extinction-a-Natural-and-Human-caused-Process.pdf

WHAT ARE BACKGROUND. EXTINCTION RATES? • Paleontologists estimate that most species “last” 1-10 million years. • If we assume there are 10 million.