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Which of the following is true of all geographic locations on earth?

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

When you start from a given set of rules and conditions and determine what must be true you are using blank reasoning