background extinction

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background extinction (b

ground

)

The ongoing extinction of individual species due to environmental or ecological factors such as climate change, disease, loss of habitat, or competitive disadvantage in relation to other species. Background extinction occurs at a fairly steady rate over geological time and is the result of normal evolutionary processes, with only a limited number of species in an ecosystem being affected at any one time. Compare mass extinction.

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extinction mass extinction			Both background extinctions, which represent most extinctions in the history of life, and mass extinctions tend to be clumped into particular evolutionary lineages," Jablonski said. Vulnerability to extinction runs in evolutionary families by Asian News International DEEP BACKGROUND To determine the background extinction rate, scientists look to the fossil record and to genetic material, or DNA, which accumulates small changes in its sequence as it is copied and passed down from generation to generation. Bye bye, birdie ... and myriad other creatures humans are wiping out by DeWeerdt, Sarah / World Watch According to David Jablonski at the University of Chicago, adaptive traits that enhance survival and diversification of species during times of background extinction tend to have little in common with those traits that increase the chances of survival during mass extinctions. Distinctions between extinctions by Science News			backcomb backcombing backcountry backcourt backcross backdate backdoor Backdown backdrop backed backer Backfall backfield backfile backfill backfire backfit backflip backflow backflowing Backfriend backgammon backgammon board background background count background extinction background knowledge background level background noise background processing background program background radiation background reading background signal backgrounder backgrounding backhand backhand drive backhand shot backhand stroke backhanded Backhandedness backhander Backheel backhoe Backhouse backie backing backing dog backing store Backjoint			Background Block Error Ratio Background Built-In Test Background check background check and charged 15 years old Background Check Central Unit Background check for work, arrest warrant Background Check information Background Check Unit background checks and marijuana Background color Background Condition Screening Background count Background count Background Debug Background Debugging Interface Background Diabetic Retinopathy background discrimination Background Dominant Color Background Draw-a-Secret Background Driver Search Background Driving Levy Process Background Edge Histogram Background Environment Simulator Background Equivalent Radiation Time Background Error Covariance Matrix background extinction Background extinction rate Background extinction rate Background Field Color Percentage Background File Transfer Program background genotype Background Imaging of Cosmic Extragalactic Polarization Background Independent Quantum Gravity Background Information Background Information Background Information and Contact Assessment Background Information Document Background Information Package Background Information Services Inc. background ink Background Intelligent Transfer Service Background investigation Background investigation Background Investigation Unit Background Investigations background knowledge background level background level background level background level background level background level Background Limited Performance background luminance background mass spectrum Background Measurement & Analysis Program

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