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Unformatted text preview: Explain how radiometric dating can be used to determine the absolute age of rock strata. Concept 25.3: Key events in lifes history include the origins of singlecelled and multicelled organisms and the colonization of land Describe the major events in Earths history from its origin until 2 billion years ago. In particular, note when Earth first formed, when life first evolved, and what forms of life excisted in each eon. Describe the timing and significance of the evolution of anaerobic metabolism, oxygenic photosynthesis, and aerobic metabolism. Explain the endosymbiotic theory for the evolution of the eukaryotic cell. Describe the evidence that supports this theory....
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- Spring '08