26. HIV/AIDS originated in Africa. How do researchers believe the virus spread? By swarms of mosquitos that migrated from the Congo's interior. By a unique species of chimpanzee that was hunted and then eaten. E By severe drought and the lack of arable land, thus reducing Africans nutrition. By immigrants from Central and South Asia that brought the disease with them.

The correct answer is: By a unique species of chimpanzee that was hunted and then eaten.<br /><br />Researchers believe that HIV/AIDS originated from a type of chimpanzee called the colobus monkey, which was hunted and then eaten by humans in Central Africa. The virus is thought to have crossed over into humans when hunters came into contact with the infected blood of the monkeys.