Which of the Following Gives the Two Main Assumptions of Theoretical

question 5

Multiple Choice

Which of the following gives the two main assumptions of theoretical models of galaxy evolution?

• A)Hydrogen and helium filled all of space, and certain regions of the universe were slightly denser than others.
• B)The beginning of the universe is modeled after a supernova explosion, and all elements were produced by this exploding star.
• C)Hydrogen and helium filled all of space, and the entire universe had exactly the same density everywhere.
• D)The universe has always been expanding, and denser areas contracted to form the first stars.
• E)The universe was composed originally only of hydrogen, and all the other elements came from stars.

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