The desert, coastline, rivers, and plateaus of Africa created physical barriers that did not allow for the migration of people or animals into Africa. The Sahara desert spans from the east coast to the west coast of the continent, isolating all of Africa to the south of it. The desert's size (it is larger than the entire continental U.S

Some common words found in the essay are:
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Approximate Word count = 475
Approximate Pages = 2 (250 words per page double spaced)