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Agricultural practices in the united states nearly led to the extinction of the peregrine falcon during the 1950s and 60s.

What are economic benefits of building dams

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