One difference between prokaryotic and eukaryotic cells is that
A. the DNA of prokaryotic cells is found in linear chromosomes, whereas the DNA of eukaryotic cells is found in a single circular chromosome.
B. eukaryotic cells are generally smaller than prokaryotic cells.
C. prokaryotic cells have a nucleus, whereas eukaryotic cells do not.
D. prokaryotic cells have existed on Earth far longer than eukaryotic cells.
Answer: D
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