Billions of Years Ago,Earth's Atmosphere Was Composed Primarily of Carbon

question 282

Multiple Choice

Billions of years ago,Earth's atmosphere was composed primarily of carbon dioxide.What happened to much of this carbon dioxide?

• A) It is still in the atmosphere.
• B) It dissolved into Earth's oceans.
• C) It was broken down into carbon and oxygen by solar ultraviolet light.
• D) It was lost to space.

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The roots or beginnings of life in terms of biology, including the genetic and evolutionary aspects that have shaped the development of living organisms.

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