According to the regional continuity model, prevented local populations of premodern homo sapiens from becoming separate species

According to the Regional Continuity Model, gene flow prevented local populations of premodern Homo sapiens from becoming separate species

Explanation:

The Regional  Continuity Moder or Multiregional Evolution Model states that Homo Sapiens did not originate in Africa exclusively; there was  a gene flow between regional populations, single, though polytypic species.

Simply said, local populations in Asia, Europe and Africa continued their evolutionary development from modern Middle Pleistocene forms to anatomically modern humans.

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.

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modern american cars are not available due to trade restrictions