Nearly all cells use ATP as their primary energy source. This is evidence that ___________________
A. life continues to evolve and use novel
energy sources
B. ATP evolved recently (in the last 100
years) as a potential source of energy
C. the use of ATP by cells began eons ago
and has been conserved
D. only eukaryotic cells can produce ATP
E. fossil fuels are composed of ATP
Answer Key: C
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