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Chimpanzee Droppings Lead Scientists to Evolutionary Discovery Simian Immunodeficiency Virus (SIV) is thought to be a precursor to HIV. This multi-part case study explores changes in SIV in different chimpanzee populations and how researchers use this information to test hypotheses about the origins of HIV.

Audience:  13-16 Source:  Kosal, Erica F. Resource type:  Classroom activity