What is the difference between eukaryotic cells and prokaryotic cells?

Eukaryotic cells contain a membrane bound nucleus and membrane bound organelles while prokaryotic cells do not. Eukaryotic cells also have a more complex structure than Prokaryotic cells

Eukaryotic cells have a more perplexing structure than Prokaryotic cells. Eukaryotic cells contain a film bound core and layer bound organelles while prokaryotic cells don't.

i'd say that the moon rock is about 2.2 billion years old.

the answer to your question is:

c. complementary base-pairing