Measurements of the amount of deuterium and the presence of very little lithium-7 in the gas clouds near quasars tell us that
A) the universe is closed.
B) the universe is open.
C) the universe is flat.
D) the universe formed more than 13 billion years ago.
E) there can not be enough protons and neutrons to make the universe flat.
Correct Answer:
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A) are
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