Based on evidence from measurements of the acceleration of the expansion rate and from careful study of the cosmic microwave background, about what percentage of the universe's total mass and energy takes the form of ordinary atomic matter (protons, neutrons, and electrons)?

A) 5%
B) 0.5%
C) 27%
D) 68%


A) 5%

Physics & Space Science

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The East African rift zone was formed by

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A room in a house has a floor area of 110 ft2 . Which of the following is most likely the approximate volume of the room?

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