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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 ...

www.dictionary.com/browse/background-extinction

Background extinction definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Look it up now!

www.thefreedictionary.com/background+extinction

Define background extinction. background extinction synonyms, background extinction pronunciation, background extinction translation, English dictionary ...

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.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 ...

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.

pediaa.com/what-is-the-difference-between-background-extinction-and-mass-extinction

Aug 11, 2017 ... The end of a species on the earth is known as extinction. There are two types of extinctions as background extinction and mass extinction.

science.sciencemag.org/content/341/6143/214.13

Jul 19, 2013 ... However, studies of extinction have tended to focus on mass extinctions, despite the fact that the background extinction represents a greater ...