Answer:
The answer is: Mediterranean Sea
Explanation:
Many people believe that the cradle of humankind is located in Africa. Many of the fossils were found in the place and these served as evidence for human evolution. The "Mediterranean Sea" is the natural barrier that separated Africa from Europe. This is were ancient human civilization emerged. This area also allowed trading to occur. Later on, many of the Romans started their expeditions, particularly across the Sahara. The main motive for these expeditions was to secure resources such as gold and spices.
Thus, this explains the answer.
