"In my view, what it does is to continue to make it more feasible that North Africa had a role to play in the evolution of modern humans." Scientists have discovered a fossilized finger bone of an early modern human in the Nefud Desert of Saudi Arabia, dating to approximately 90,000 years ago. The early human techno-tradition, known as Howiesons Poort, associated with Homo sapiens who lived in southern Africa about 66,000 to 59,000 years ago indicates that during this period of pronounced ...
Because certain genetic changes occur at a steady rate per generation, they provide an estimate of the time elapsed.
These changes accrue like the ticks on a stopwatch, providing a “molecular clock.” By comparing DNA sequences, geneticists can not only reconstruct relationships between different populations or species but also infer evolutionary history over deep timescales.
Leopard, hyena and other predators' fossils were among the finds, but Steele found little evidence that the nonhuman predators had gnawed on the gazelle and other prey.
Steele said the findings support the idea that Middle Stone Age began just over 300,000 years ago, and that important changes in modern human biology and behaviour were taking place across most of Africa then.
utations are changes to the letters of DNA’s genetic code—for instance, a nucleotide guanine (G) becomes a thymine (T).