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We are confident that our ancestors originated in Africa because
The earliest fossils of ancestral hominids (australopiths) are found there.
The oldest remains of modern human beings (Homo sapiens sapiens) occur there.
African populations have the highest genetic diversity, which would have required longer to evolve.
We all share and diverge from our African DNA, indicating that it is our original DNA.
All of the these
None of these.