Scientists estimate that for more than _______ years after cells originated, all organisms consisted of one cell.
A) 2,500
B) 250,000
C) 2.5 million
D) 2.5 billion
E) 2.5 trillion

Name: Scientists estimate that for more than _______ years after cells originated, all organisms consisted of one cell. A) 2,500 B) 250,000 C) 2.5 million D) 2.5 billion E) 2.5 trillion
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Scientists estimate that for more than 2.5 billion years after cells originated, all organisms consisted of one cell.

Scientists Estimate That for More Than _______ Years After Cells