No idea what primary research so i'm going to assume you mean primary source in which case it depends on the type of evidence, like if it's a personal account then that's a primary source but if it's someone telling of someone else's story it's not.
Answer:
Most people worship Buddhism
The political system in Ancient Rome was based on competition with the ruling elite, the military was a key element to the political system of Ancient Rome that was generally based on competition within the ruling class. An individual social standing impacted their political and military roles. War was significant towards Roman expansion to the Northern Hemisphere, it was characterized by; grabbing of land, military might, strategic ability and political capabilities of the generals that determined their political leadership
Answer:
James Buchanan
Explanation:
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The transfer of plants, animals, people, and diseases between hemispheres. This would be the correct answer!!!