Biological processes have removed most of the _______ from the Earth's atmosphere.
A) carbon dioxide
B) nitrogen
C) hydrogen
D) oxygen
E) argon
Correct Answer:
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Q47: The surface of Venus is hidden by
Q48: The inner planets are sometimes called the
Q49: Martian winds have created _.
A) polar ice
Q50: The nucleus of a comet is a
Q51: The atmosphere of Venus is dominated by
Q53: _ dominate the topography of lunar highlands.
A)
Q54: The existence of huge channels that look
Q55: The Moon's _ explains why it is
Q56: The absence of fold mountains and the
Q57: The largest part of a(n) _ is
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