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The ______ Theory believes around 13.7 billion years ago the universe was a single point. The point ____ due to heat and density. Then the temperature and density decreased and the universe cooled.

answer choices are heliocentric expanded big bang and gravity

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The Big Bang Theory believes around 13.7 billion years ago the universe was a single point. The point expanded due to heat and density. Then the temperature and density decreased and the universe cooled.

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