Nothing more but a coincidence.
I think its funny when either side tries to pull the "probability" or "coincidence" card. In order to have a probability you need a sum set of all possibilities with one desired outcome being the probability to be calculated. If you role a die, you have a sum set of six possibilities and choosing a 4 gives you a one in six chance of having that desired outcome actualized.
Existence doesn't work that way. There's no "sum set" of possible universes. There is either one universe, the one we see, and it just "is", or there are an infinite number of possible universes: one where dogs fly, one where we have seven legs, one where you live in Annapolis, one where a proton weighs 3 tons, one where all of these things happen, one where none of these things happen. So if there is the one universe that just is, then the probability of it occurring is 1 because the sum set is 1. If there are infinite universes then the probability of it occurring is 0 because the sum set is infinity.
Maybe there are only three universes: this one, the one where you live in Annapolis, and the one where dogs fly. In this case, then its a 1 in 3 chance that we are the way we are. But you're still left with the lingering idea of why the other two exist. In fact, you're still left with the question of why anything exists at all.
So, if there are an infinity of universes or if there are 3 or if there is only one, you're still left with the confusing notion of why a universe exists in the first place.
If you try and make the same argument about Life's existence you run into the exact same problem.
And if your argument is that its "just a coincidence" then that is no more potent an argument than "God did it".