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  • Every person living on earth today belongs to

  • the same species: Homo sapiens.

  • And humans worldwide have always been curious

  • about our origins.

  • <phrases in other languages>

  • "Where do we come from?"

  • We can now trace our origins back at least six million years

  • to Africa, where the earliest humans evolved.

  • Several early human species emerged there,

  • and survived in a variety of environments and climates

  • before evolving into new species or going extinct.

  • About two million years ago some populations of

  • early humans began to spread beyond Africa.

  • Over hundreds of thousands of years populations moved

  • into Asia where they faced the challenges of yet new

  • environments and climates.

  • New species continued to evolve,

  • and eventually go extinct.

  • Then about two hundred thousand years ago,

  • a new species evolved in Africa.

  • These were the first modern humans,

  • the first members of our own species,

  • the ancestors of every

  • human being alive today.

  • We can all trace our DNA back to these

  • African origins.

  • Over time populations of Homo sapiens spread

  • throughout Africa into Europe and western Asia.

  • In some of these places early human species lived on

  • the verge of extinction.

  • This journey of Homo sapiens began during

  • challenging times.

  • There were extreme droughts and monsoons in Africa,

  • and other environmental upsets there and in Asia.

  • At one point our species' population was reduced to

  • no more than 10,000 adults.

  • We nearly became extinct.

  • But we are an adaptable species.

  • Our ability to use our human traits to meet new

  • challenges enabled us to survive.

  • While earlier human species became extinct,

  • modern humans continued to spread around the world.

  • By about 17,000 years ago,

  • Homo sapiens was not only a worldwide species,

  • we were the sole surviving human species.

  • We left behind a trail of fossils,

  • evidence of our epic worldwide journey.

  • Like some earlier humans, we evolved differences in skin

  • color and hair texture as we adapted to different

  • environments.

  • But these differences are only skin deep.

  • They follow along the continuum and do not

  • separate modern humans into the categories

  • some people call "races."

  • The DNA of all modern humans is 99.9% identical.

  • You are part of this six million year story of

  • adaption and survival.

  • It is written in the language of your genes,

  • in every cell of your body.

  • With the billions of other humans living today,

  • you can say,

  • <phrases in other languages>

  • "We are all one species."

Every person living on earth today belongs to

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人間の起源。一つの種、世界に生きる (Human Origins: One Species, Living Worldwide)

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    Mark Lin に公開 2021 年 01 月 14 日
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