Snood,
I would like to point out (referring somewhat to Rosbournes post) that things ( from a genomic point of view) sometimes can happen relatively quickly.
This is simply a result of the random triggering of unexpressed genes.
You and I and every other living organism have a whole lot of garbage in our genes. Basically when several (or many) coincide a new species results. Whether it is successful or not depends on Darwin's theory which has largely been shown to be a fair representation of observations. The odds against a successful speciation occurring on a planet that already harbors life are astronomical. (Somebody else already here will eat it)
Farmerman is much more up on the differentiation of species than I. If he would care to expound on the brachiation of species (he has before
![Smile](https://cdn2.able2know.org/images/v5/emoticons/icon_smile.gif)
) and if you care to consider the very numbers of experiments performed by natural methods (as opposed to divine) then the occurrence of our intelligence becomes unremarkable, possibly unique, and inevitable. It's simply the surviving echo of a number of interactions that can only be calculated with the help of exponents.
Figure the number of cubic centimeters of water on Earth, multiply by the number of elements, multiply by 4000 (the number of observed interactions per cc.) multiply by the number of seconds since Earth was formed, and then figure how long it will take before all possible interactions will take place on Earth.
It will happen, somewhere, sometime , someplace. Actually I have calculated that life will appear on an Earthlike planet somewhere in a time frame of between one and a half seconds and one hundred twenty hours. The lower figure IMO is more likely to be accurate. I suspect that the rate of speciation is similar. We just don't see it
![Exclamation](https://cdn2.able2know.org/images/v5/emoticons/icon_exclaim.gif)
We can also miss easily a very few skeletons. ( which may never have existed at all)