What data supports the idea of the universal expansion rate


Problem: What data supports the idea of the universal expansion rate?

A. The percentage of carbon dioxide in Earth's atmosphere increases.

B. Observations have shown that the matter in the universe is about 73% hydrogen and 25% helium.

C. Scientists discover that 99% of the universe's mass is hydrogen.

D. Distant galaxies move progressively farther away from Earth.

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