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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!

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.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.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.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.ask.com/youtube?q=Background+Extinction&v=ZxXThhG9XYU
Jan 21, 2016 ... Extinction? defining background and mass study . , . . . . Background extinction refers to the normal extinction rate. Differences between ...

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.