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No references found			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			backdeep backdigger backdrop backed cloth backer strip backerboard backfile conversion backfill backfill concrete backfilling backfire backfire antenna backflap hinge backflash backflooding backflow backflow connection backflow preventer backflow valve backfolding backfurrow backgammon background background count background discrimination background extinction background genotype background ink background luminance background mass spectrum background noise background processing background program Background Radiation background reflectance background returns background signal backhand backhand welding backhaul backhoe backhouse Backhuysen, Ludolf backing backing board backing brick backing cloth backing coat backing deals backing dog backing off			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 Limited Performance background luminance background mass spectrum Background Measurement & Analysis Program Background Measurement Satellite

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