During<span> the high </span>Middle Ages<span>, the </span>Roman Catholic Church<span> became organized into an elaborate hierarchy with the pope as the head in western Europe. He establish supreme power.</span>
A. Violent attacks form the Eastern tribes even led to the downfall of Rome, as soon as the mongols got to Rome they had no challenge in defeating such a weak nation in it's decline.
Answer:
B
Explanation:
They had to adapt to new environments. B is the answer to this question.
