1. What is one (or more) important reason to protect national parks? 2. What is one (or more) threat to our national park system?
3. Where is a surprising place they might create a national park someday?
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Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted