B.during the period of Viking,Magyar and Muslim invasions.
Answer:
hope this helps
Explanation:
Segregation is made up of two dimensions: vertical segregation and horizontal segregation.
To cause a source to be biased means that it is influenced by your opinion or another factor that is not factual. Bias can take away from the credibility because it is not completely true, as a source should be.
-<span>world's longest human made structure at more than four thousand miles actually
</span>-co<span>nstructed from a series of smaller walls that were connected together built
</span><span><span>
-to guard against Mongol invaders</span></span>
