Fossil of archaepoteryx
Ok if natural selection causes evolution, then that must mean that the process of evolution is slow and gradual.
Evolution IS slow and gradual. Adaptation isn't, but evolution happens over geological eras ; it takes a long time for one species to evolve into another - an example that is still in existance is the mudskipper. Now this little creature is not quite a fish, not quite an amphibian, but a transitional species between the two (guess he's a little late huh
There have been a number of transitional fossils (homo and otherwise) found but it must be understood that the fossilization of a carcass is a very rare occurance. Think of all the species must have existed! We'd be overrun by them if most of them didn't decompose.
With Natural Selection being the cause of evolutionary change, that would mean that speciation would occur thorought this slow process and therefore some form of transitional stage between species would exist in the fossil record but that is not the case.
I hate to reiterate, but that IS the case. Look at cro-magnon, neanderthal (although, yes, neanderthal never turned into homo sapean). All of the early Equus fossils - between horse and zebra, for example. Or how about the giraffes with short necks? that gradually got longer?
Evolution is a gradual process - we've yet to see one species become another (in recorded history) but the evidence is there - the slow changes that will eventually (perhaps) result in new species or subspecies ; transitional fossils and animals.
And yeah, I think we can keep our cool