Not only is there no common ancestor for humans and chimpanzees, but the common belief amongst "evolutionary biologists(TM)" regarding a common ancestor for us and neanderthals only works for people who've never taken a basic logic course. The neanderthal has been completely ruled out as a plausible ancestor for modern man by DNA analysis since the genetic gap is simply too wide and all other hominids were much further removed from us than the neanderthal; i.e. if we could not be descended from the neanderthal, there is nothing else on the planet which we could be descended from.
Moreover this lack of true intermediate species is the general and unbroken rule on this planet. Darwin's vision of gradualistic evolution required that the vast bulk of all fossils be intermediates and all anybody has ever produced has been a handful of arguable cases.
Moreover, this lack of intermediate fossils was the main motive for Gould, Eldridge, Myer et. all. in devising the new defacto standard variant of evolutionism called "punctuated equilibria" or "punk-eek". If there was any rational way anybody could claim that there really are lots of intermediate fossils if you just look carefully enough, then Gould and Eldridge would not have bothered.
Real science theories do not need to be reinvented every twenty or thirty years. Punk-eek is entirely idiotic for a number of reasons not involving fossil counts and amounts to a claim of a massive refutation of the basic laws of mathematics and probability. In particular the claim that every species on Earth has arisen from genetic advantages acquired by "peripheral isolates" is like requiring Custer to win at Little Bighorn every day for tens of billions of years.
Basically, nobody with anything resembling brains or talent is defending evolution at this juncture; it is being defended by dead wood and second and third raters.
Pure and utter nonsense.
Modern man's earliest known close ancestor was significantly more apelike than previously believed, a New York University College of Dentistry professor has found.
A computer-generated reconstruction by Dr. Timothy Bromage, a paleoanthropologist and Adjunct Professor of Biomaterials and of Basic Science and Craniofacial Biology, shows a 1.9 million-year-old skull belonging to Homo rudolfensis, the earliest member of the human genus, with a surprisingly small brain and distinctly protruding jaw, features commonly associated with more apelike members of the hominid family living as much as three million years ago. http://www.sciencedaily.com/releases/2007/03/070324133018.htm
Moreover this lack of true intermediate species is the general and unbroken rule on this planet.
All extinct species are intermediate species
Basically, nobody with anything resembling brains or talent is defending evolution at this juncture; it is being defended by dead wood and second and third raters.
Thousands of PhDs are wrong and Wendy1946 is right. Your ignorance of the topic is profound.
If you actually studied evolution before making such definitive statements about it you would look less the fool.
Fossil From Last Common Ancestor Of Neanderthals And Humans Found In Europe, 1.2 Million Years Old