The first life forms on Earth arose:
A) more than 3.5 billion years ago.
B) at the same time as the formation of the Earth.
C) relatively recently - about 250,000,000 years ago.
D) about 10,000 years ago.
Correct Answer:
Verified
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Q7: In the scientific method, scientific theories:
A) must
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Q10: The world ocean:
A) plays a minor role
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Q12: Life on Earth probably evolved in the
Q13: After Earth's formation, the planet's ocean did
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