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(Photosynthesis)
? (Remember?we are still under water)
? A few microorganisms "learn" to use the waste O2 of photosynthesis?
? Cells develop modes of locomotion
3.0 ? 5.0 Million years ago
? The waste of photosynthesis is oxygen. O2 escapes the ocean and begins to accumulate in the atmosphere, eventually forming the ozone. Ozone protects from solar radiation. Making the land/air habitable.
1.5 Billion years ago
? Cells begin sticking together to form multi-cellular clusters
? Invertebrate diversity explodes
? (We are still in water)
450 ? 375 Million years ago
? Various plants inhabit the land...
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