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Microbial Cells First Evolved on Earth Approximately ________ Billion Years

Question 72

Multiple Choice

Microbial cells first evolved on Earth approximately ________ billion years ago.

A) 1.6 to 1.8
B) 3.8 to 4.3
C) 5.4 to 5.6
D) 7.0 to 7.2

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