Why didn\'t oxygen begin to accumulate in the atmosphere untilapproximately 1.5
ID: 1729079 • Letter: W
Question
Why didn't oxygen begin to accumulate in the atmosphere untilapproximately 1.5 billion years after life appeared on Earth?A) Early forms of animal life consumed the oxygen.
B) All the oxygen produced by life went into making the ozonelayer.
C) Early forms of plant life consumed oxygen.
D) Oxygen produced by life was removed from the atmosphere bydissolving in the ocean.
E) Oxygen produced by life was removed from the atmosphere byoxidation reactions with surface rocks.
The only place outside of Earth where there is irrefutable evidencefor (ancient, microbial) life is
A) Titan.
B) Mars.
C) Europa.
D) the Moon.
E) None of the above—there is no irrefutable evidence forlife beyond Earth.
After Mars, the next most likely candidates for life in the solarsystem are
A) Kuiper-belt comets.
B) the jovian planets.
C) asteroids.
D) the large moons of the jovian planets.
E) Oort-cloud comets.
Explanation / Answer
Why didn't oxygen begin to accumulate in the atmosphere untilapproximately 1.5 billion years after life appeared on Earth? A) Early forms of animal life consumed the oxygen. B) All the oxygen produced by life went into making the ozonelayer. C) Early forms of plant life consumed oxygen. D) Oxygen produced by lifewas removed from the atmosphere by dissolving in theocean. E) Oxygen produced by lifewas removed from the atmosphere by oxidation reactions with surfacerocks. The only place outside of Earth where there is irrefutable evidencefor (ancient, microbial) life is A) Titan. B) Mars. C) Europa. D) the Moon. E) None of theabove—there is no irrefutable evidence for life beyondEarth. (ummm... duh) After Mars, the next most likely candidates for life in the solarsystem are A) Kuiper-belt comets. B) the jovian planets. C) asteroids. D) the large moons of thejovian planets. E) Oort-cloud comets.
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