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Chapter 17 History of Life PTHS 2014

Evidence for Change Across Time

"A Brief Survey of Fossil Groups"

Examples of fossils include preserved

Early Earth 4.6 Billion •The Earth formed about ________________ years ago. Oxygen •There was little ________________. •Scientists have found fossils of ___________________ in Bacteria 3.5 Billion rock that formed __________________ years.

The History of Life

Chapter 17 History of Life PTHS 2014

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Transcript Chapter 17 History of Life PTHS 2014

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