Which of the following statements best describes changes in earth's environment over the past 4 billion years?
solar brightness and oxygen generally decrease, while surface temperature and atmospheric co2 increase.
solar brightness and surface temperature generally increase, while oxygen and atmospheric co2 generally decrease.
solar brightness and oxygen generally increase, while surface temperature and atmospheric co2 decrease.
solar brightness and surface temperature generally decrease, while oxygen and atmospheric co2 generally increase.
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Which of the following statements best describes changes in earth's environment over the past 4 bill...
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