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Second Purple Earth?
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YouTube videos curated by Class Central.
Classroom Contents
How and Why Earth Went From Purple to Green - Twice
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- 1 Life on Early Earth
- 2 Photosynthesis on Early Earth
- 3 Contrasting Colors of Photopigments
- 4 Purple Earth Hypothesis
- 5 Phototrophy vs Photosynthesis
- 6 Purple vs Green Phototrophs
- 7 From Purple To Green Earth
- 8 Evidence for Purple Earth
- 9 Rise of Photosynthesis
- 10 Second Purple Earth?
- 11 Transition to Green Earth
- 12 Using Pigments to Find Aliens?