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Although Earth Is Estimated to Be 4-5 Billion Years Old,and

Question 6

Multiple Choice

Although Earth is estimated to be 4-5 billion years old,and although life first appeared a little less than 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

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