Por que a África do Sul Egito Argélia Libia e nigèria possuem um destaque no continente africano? (Descreva as características de cada pais refente as suas potencialidades).

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