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Chapter 25 Slides Sections 1-3

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Photosynthesis and the Oxygen<br />

Revolution<br />

• Most atmospheric oxygen (O 2 ) is of biological<br />

origin<br />

• O 2 produced by oxygenic photosynthesis<br />

reacted with dissolved iron and precipitated<br />

out to form banded iron formations<br />

AP Biology<br />

© 2011 Pearson Education, Inc.

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