For life to flourish on earth, several changes occurred that affected the atmosphere, such as
1. evolution of cyanobacteria that produce o2.
2. volcanic outgassing to create a thicker atmosphere.
3. formation of an ozone layer to block harmful radiation.
4. all of the above.
5. only a and c.
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For life to flourish on earth, several changes occurred that affected the atmosphere, such as
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