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Asked by 292nenp43 to Sonia on 16 Nov 2018.
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Sonia Lenehan answered on 16 Nov 2018:
Because that is the way we have evolved over time! This article is great for documenting what we know about humans and how we came to be! https://theconversation.com/the-origin-of-us-what-we-know-so-far-about-where-we-humans-come-from-54385
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