Although photovoltaic solar farms appear to be a free resource with few negative impacts, there are environmental problems related to this type of renewable energy production. Which statement explains the limits to the sustainability of solar panel farms to produce electricity for a city in a more developed country?

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