Earth is approximately _______ years old.
A) 5.5 million
B) 40-50 million
C) 4.5 billion
D) 5 trillion
E) 40 trillion
Correct Answer:
Verified
Q12: Cells are characterized by
A) an aggregation of
Q13: There has been life on Earth for
Q14: Which is not a characteristic of most
Q15: Photosynthesis was a major evolutionary milestone for
Q16: Refer to the figure below. 
Q18: The basic structural and physiological unit of
Q19: Which statement about aerobic metabolism is false?
A)
Q20: Which of the following statements about viruses
Q21: Scientists' ability to reconstruct evolutionary history has
Q22: Which scientific name is written incorrectly?
A) Homo
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