C. The percentage of ordinary matter has grown in scientists' estimates
D. The percentage of unknown materials has grown in scientists' estimates since the 1970s
How has scientific understanding about the composition of the universe changed over time? Select the TWO correct answers.
A. The percentage of dark energy has shrunk in the scientists' estimates
B. The percentage of dark matter has shrunk in scientists' estimates since the 1980's
C. The percentage of ordinary matter has grown in scientists' estimates
D. The percentage of unknown materials has grown in scientists' estimates since the 1970s
1 answer
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