<em><u>Answer</u></em>
<em><u>about 3.9 billion years ago</u></em>
<em><u>about 3.9 billion years agoThe most recent common ancestor of all currently living organisms is the last universal ancestor, which lived about 3.9 billion years ago.</u></em>
Hey there,
The answer is leukemia
It happens when your bone marrow starts to produce to much of white blood cells that are not fully developed. Thus they cannot function properly.
Hope this helps :))
<em>~Top♥</em>
The similarities between bones of humans and other animals shows that every living creature on earth has a common ancestor, even if that common ancestor is as simple as a sing-celled organism.
