That's not how science works. Science doesn't do 'proof'. Science tests hypothesis and theories that are based on evidence. The theory of evolution is based on several independent lines of evidence. The theory of common descent is well supported. If you would like to read how, read the following but until you do, you might want to reserve making comments on the matter. You seem to be making them while you are still ill informed on what the theory of evolution actually is and how it is supported.
http://www.talkorigins.org/faqs/comdesc/
That you ask for 'proof' shows that your understanding of science and what it is is lacking. Evidence either supports or falsifies a theory. It does not 'prove' a theory. That is true for science from atomic theory to the theory of relativity.
Care to fathom a guess as to which of the skulls are human and which are apes? Where would you draw the line? Why? What would you use as a distinction?
What is the difference between humans and apes? Can you name 3?