Because we all have a common ancestor that lived not that long ago[0]<p>0. <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Mitochondrial_Eve" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Mitochondrial_Eve</a>