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If humans evolved in a tiny area of Africa, they only saw plants and animals within a 100-kilometre radius for a million years. When they began to migrate, there would have been different animals and plants - and potentially a lot of allergy issues.
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
If humans evolved in a tiny area of Africa, they only saw plants and animals within a 100-kilometre radius for a million years. When they began to migrate, there would have been different animals and plants - and potentially a lot of allergy issues. by : Barry Marshall