Final answer:
The HIV/AIDS virus first appeared in the 20th century and is believed to have originated from chimpanzees in Central Africa. It was first identified in the early 1980s when a cluster of unusual illnesses and deaths occurred in the United States.
Step-by-step explanation:
The HIV/AIDS virus first appeared sometime in the 20th century. It is believed to have originated from chimpanzees in Central Africa and crossed over to humans through the consumption of infected meat or through hunting and butchering practices. The virus was first identified in the early 1980s when a cluster of unusual illnesses and deaths were observed in the United States among previously healthy individuals, leading to the discovery of HIV, the virus that causes AIDS.
Learn more about The origin and identification of the HIV/AIDS virus