Earth's modern atmosphere ____.
A) is composed of 78 percent nitrogen
B) does not filter high-energy ultraviolet rays
C) is similar to that found on Venus
D) is composed of 80 percent oxygen
Correct Answer:
Verified
Q21: _ is the release of volatiles from
Q22: Earth's primordial atmosphere _.
A) contained no oxygen
B)
Q23: The rise of oxygen in the modern
Q24: Earth's earliest organisms were probably _.
A) multicellular
Q25: Which of the following shows the correct
Q27: The atmosphere becomes _.
A) less dense with
Q28: The First Great Oxidation Event was likely
Q29: The layer of air closest to Earth's
Q30: In the _, temperature increases with altitude,
Q31: Which statement describes the process of photosynthesis?
A)
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