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Chapter 25 Slides Sections 1-3

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2 nd Endosymbiosis<br />

• Evolution of eukaryotes<br />

origin of chloroplasts<br />

engulfed photosynthetic bacteria,<br />

but did not digest them<br />

mutually beneficial relationship<br />

• natural selection!<br />

photosynthetic<br />

bacterium<br />

Eukaryotic<br />

cell with<br />

mitochondrion<br />

chloroplast<br />

Endosymbiosis<br />

mitochondrion<br />

AP Biology<br />

Eukaryotic cell with<br />

chloroplast & mitochondrion

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