The atmosphere is a mixture because it contain many types of gases , liquids and solids.
i believe the answer is b radioactive nucleotide
Answer:
The galaxies are moving away from Earth because the fabric of space itself is expanding. While galaxies themselves are on the move — the Andromeda Galaxy and the Milky Way, for example, are on a collision course — there is an overall phenomenon of redshift happening as the universe gets bigger.
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