Earth Science – Unit 9: Earth’s Atmosphere. Lesson 1:Evolution of the Atmosphere – Flashcards
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The first major source of oxygen gas was _____.
answer
cyanobacteria.
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The atmosphere has many roles, including:
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provides gases for respiration and photosynthesis provides protection from UV radiation and meteorites stabilizes a habitable temperature
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Most life would not be possible without our unique atmosphere.
answer
True.
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