Problem:
I was watching a lecture by Richard Dawkins earlier today and he mentioned that "Your 185th million grandfather was a fish." I started wondering about the following question,
Question: Is it true that my 185th million grandfather is the same as your 185th million grandfather?
Now, I fully recognize that there are more generations in my family tree than in yours or vice-versa so the 185 million may not match up exactly.
Question: Do Humans share a common ancestor substantially after the origin of life?