How would the building of underwater cities contribute to the fastest growing environmental science fields?

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

Which event had the greatest impact on culture of south america

Choose the correct chronological or of the time periods