When life first began,
A) the planet had a lot of oxygen in the atmosphere and was much warmer.
B) the planet had a lot of oxygen in the atmosphere and was much cooler.
C) the planet had a lot of methane in the atmosphere and was much warmer.
D) the planet had a lot of methane in the atmosphere and was much cooler.
E) the planet had very little oxygen in the atmosphere and was much cooler.
Correct Answer:
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