What are the advantages and disadvantage of groynes

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

Choose the item that is an example of the geographic theme of place.

How did geography influence the settlement of early africa.