Archaeologists don't, human origins is the domain of anthropologists. There's some overlap, but they're different professional specialties. Anyway, multiple co

Archaeologists don't, human origins is the domain of anthropologists. There's some overlap, but they're different professional specialties. Anyway, multiple concurrent lines of evidence. You're morphologically similar to ancient African ancestors. The serial founder effect points to Africa. Molecular clocks point to Africa. Fossil evidence points to Africa. Anthropologists don't think anatomically modern humans originated exclusively in the places with the most fossils though. That's just where we find the most fossils.