Where human from?

Currently,　66　hundred million people live in the earth. Disregard detail, human has same body regardless of where he lives. I think this fact is very amazing fact. Why every human have same body? Probably, they have same an ancestor. According to Univercity of California group's report, DNA ,which in the mitochondria, is inherited from one's mother absolutly. With this clue to go on, they traced back 147 people's ancestry. As a result of this report, they find a common to all human's ancestor. The madia named her name "Mitochondria Eve". So, All human is her relation.