The primitive Earth's atmosphere contained very little to no ____.
A) water vapor
B) free nitrogen
C) free hydrogen
D) free oxygen
E) inert gases
Correct Answer:
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Q20: Four of the five answers represent likely
Q21: While it is very difficult to find
Q22: Chloroplasts _.
A)evolved from cyanobacteria
B)have been found as
Q23: Oxygen released by _ accumulated in early
Q24: By one hypothesis, clay _.
A)facilitated assembly of
Q26: Four of the five answers below were
Q27: Life probably never would have emerged if
Q28: What has been detected in meteorites that
Q29: Experiments like those first performed by Miller
Q30: Before DNA, _ likely served as the
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