The MOST likely origin of human HIV1 virus is a related virus that infects:

Question

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HIV1 is believed to have originated from a related virus that infects chimpanzees known as SIVcpz (Simian Immunodeficiency Virus). Studies have shown that HIV1 strains are closely related to SIVcpz strains found in wild chimpanzee populations. Other options such as horses, sheep, cows, and cats are not known to be hosts of similar viruses that could have led to the development of the human HIV1 virus.

The MOST Likely Origin of Human HIV1 Virus Is a Related