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Plenty of gazelle meat, with the occasional wildebeest, zebra and other game and perhaps the seasonal ostrich egg, says Teresa Steele, a paleoanthropologist at the University of California, Davis, who analyzed animal fossils at Jebel Irhoud.Steele, who studies how food sources and environmental change influenced human evolution and migration, was part of the international research team that began excavating at the site in 2004.UC Davis anthropologist Teresa Steele studied animal bones from the site, showing that our ancestors ate lots of gazelle and other game as well as ostrich eggs. The site contains the oldest-known skeletons of modern humans.UC Davis anthropologist Teresa Steele studied animal bones from the site, showing that our ancestors ate lots of gazelle and other game as well as ostrich eggs.Gazelle Bones Common Steele sifted through hundreds of fossil bones and shells, identifying 472 of them to species as well as recording cut marks and breaks indicating which ones had been food for humans. Among the other remains, Steele also identified hartebeests, wildebeests, zebras, buffalos, porcupines, hares, tortoises, freshwater molluscs, snakes and ostrich egg shells. "It really seemed like people were fond of hunting," she said.Cuts and breaks on long bones indicate that humans broke them open, likely to eat the marrow, she said.
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.
This tells them how long it’s been since the individuals shared ancestors.
omparison of DNA between you and your sibling would show relatively few mutational differences because you share ancestors—mom and dad—just one generation ago.
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.
But in aggregate, over many generations, these changes lead to substantial evolutionary variation.