Where did Earth's atmosphere originate?
a. Earth's gravity trapped gases from passing comets.
b. Gases were released from Earth itself as it cooled.
c. Earth’s gravity trapped gases from Earth itself.
d. Earth’s gravity trapped gases from passing comets, gases were released from the Earth itself as it cooled, and
Earth’s gravity trapped gases from the Earth itself.
e. Gases were released from Earth itself as it cooled Earth’s gravity trapped gases from the Earth itself.
ANSWER: e
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