Multiple Choice
The figure above shows the geological times scale. The Earth's atmosphere has been oxygen rich for
A) about 500 million years.
B) its entire history.
C) about 2 billion years.
D) a few million years.
Correct Answer:
Verified
Correct Answer:
Verified
Related Questions
Q25: What evidence suggests that life arises relatively
Q26: According to fossil evidence, how far back
Q27: Why don't we expect to find life
Q28: Which of the following gases, which we
Q29: The Voyager I and II spacecraft visited
Q32: How do scientists study the history of
Q33: Briefly summarize current knowledge about the term
Q34: The Kepler mission has searched for Earth-
Q35: The requirement of liquid water is the
Q96: What is the evidence that suggests planetary