Which geographic feature encouraged people to settle in the great plains? a. the area has rocky hills b. the area has a tropical climate. c. the area has many large lakes d. the area has fertile soil

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