http://digfir-published.macmillanusa.com/life11e/life11e_ch24_1.htmlChapter Introduction57ae383e757a2eff46000001
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_2.htmlkey concept 24.1 Events in Earthâs History Can Be Dated
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_3.htmlRadioisotopes provide a way to date fossils and rocks
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_4.htmlRadiometric dating methods have been expanded and refined
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_5.htmlScientists have used several methods to construct a geological time scale
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_7.htmlkey concept 24.2 Changes in Earthâs Physical Environment Have Affected the Evolution of Life
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_8.htmlEarthâs continents and climates have changed over time
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_9.htmlEarthâs climate has shifted between hot and cold conditions
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_10.htmlVolcanoes have occasionally changed the history of life
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_11.htmlExtraterrestrial events have triggered changes on Earth
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_12.htmlOxygen concentrations in Earthâs atmosphere have changed over time
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_13.htmlExtinction happens continuously, but mass extinctions result from sudden environmental changes
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_15.htmlkey concept 24.3 Major Events in the Evolution of Life Can Be Read in the Fossil Record
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_16.htmlSeveral processes contribute to the paucity of fossils
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_17.htmlPrecambrian life was small and aquatic
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_18.htmlLife expanded rapidly during the Cambrian period
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_19.htmlMany groups of organisms that arose during the Cambrian later diversified
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_20.htmlGeographic differentiation increased during the Mesozoic era
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_21.htmlModern biotas evolved during the Cenozoic era
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_22.htmlThe tree of life is used to reconstruct evolutionary events
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_24.htmlInvestigating Life57ae383e757a2eff46000001
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_25.htmlChapter Summary
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http://digfir-published.macmillanusa.com/life11e/life11e_ch24_26.html Apply What Youâve Learned
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