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Although Earth Is Estimated to Be 5 Billion Years Old

Question 96

Multiple Choice

Although Earth is estimated to be 5 billion years old, and although life first appeared about 4 billion years ago, land plants did not appear until about _______ years ago.


A) 3-4 billion
B) 400-500 million
C) 40-50 million
D) 3-4 million
E) 400,000-500,000

Correct Answer:

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