Depends on what kind of life you consider. It's true for mammals. It's true for animals. It's probably even true further up our ancestry. But apparently it does

Depends on what kind of life you consider. It's true for mammals. It's true for animals. It's probably even true further up our ancestry. But apparently it doesn't mean that "all things that have genes" share a subset of genes from the same common ancestor. As I understand it that's because they share a common ancestor that didn't have genes (but at that point I'm not sure whether "ancestor" is even the right word).