The rugged landscape created by volcanic eruptions and tectonic plate shifts in east and south Africa millions of years ago may be what prompted our human ancestors to start walking on two legs. The rugged landscape created by volcanic eruptions and tectonic plate shifts in east and south Africa millions of years ago may be what prompted our human ancestors to start walking on two legs.
The rugged landscape created by volcanic eruptions and tectonic plate shifts in east and south Africa millions of years ago may be what prompted our human ancestors to start walking on two legs.

Modern humans' ancestors coaxed onto two legs by rough terrain, study finds

The rugged landscape created by volcanic eruptions and tectonic plate shifts in east and south Africa millions of years ago may be what prompted our human ancestors to start walking on two legs. The rugged landscape created by volcanic eruptions and tectonic plate shifts in east and south Africa millions of years ago may be what prompted our human ancestors to start walking on two legs.
The rugged landscape created by volcanic eruptions and tectonic plate shifts in east and south Africa millions of years ago may be what prompted our human ancestors to start walking on two legs.
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