Venus and Mars have little free oxygen in their atmospheres.What has allowed Earth to have a large amount of oxygen in its atmosphere?
A) bombardment
B) cyanobacteria and other photosynthesizing organisms
C) volcanism
D) water on Earth's surface
Correct Answer:
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Q7: All terrestrial life is _-based.
A) carbon
B) hydrogen
C)
Q8: Which of the following is the study
Q9: If we model the history of Earth
Q10: Why was the impact 65 million years
Q11: Terrestrial life is carbon-based and requires _
Q14: If we model the history of Earth
Q15: The early Earth suffered a long period
Q16: We search for intelligent life in the
Q17: In 1952,chemists Harold Urey and Stanley Miller
Q26: Which one of the following is NOT
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