Life first evolved on Earth _______ years ago.
A) more than 5 billion
B) between 3 billion and 5 billion
C) between 2 billion and 3 billion
D) between 1 billion and 2 billion
E) less than 1 billion
Correct Answer:
Verified
Q48: Approximately _ species in the current biota
Q49: Approximately _ fossil species have been described.
A)
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Q54: Which of the following statements about the
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Q56: The Cambrian explosion started _ the Cambrian
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Q58: Which of the following statements about the
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