Please help me with this:) thank in advance:)

Eastern europe’s population growth can be attributed to these factors. select all that apply migration

Find the area of the shaded region.

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