There is convincing evidence that water once flowed on the surface of Mars.
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Q14: Oxygen first began to accumulate in Earth's
Q19: A galaxy is a huge rotating aggregation
Q20: The temperature of the ocean about four
Q21: Scientists predict that our planet in its
Q22: Saturn's moon, Titan, is known to possess
Q24: The universe began to form around 13
Q25: Which phrase best describes biosynthesis?
A)The discovery of
Q26: Evidence suggests that the first living molecules
Q27: To recreate an environment for biosynthesis, scientists
Q28: Life on Earth probably evolved in the
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