thranx said:
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Following human genetics we can trace back a large number of homologous genes to simpler organisms. Even more important is the structure of our proteins and enzymes. For example, many of our digestive enzymes are almost identical in structure to enzymes used by bacteria (also to break things down) and can be traced in virtually all living organisms. These stuctures can be very different in DNA sequence barring a few key points and using bioinformatics we can trace the evolution on a genetic (DNA sequence), structural (proteins and enzymes) and functional level. That's the evidence ignoring the fossil record.
The evidence is there (and a lot is on wiki):
http://en.wikipedia.org/wiki/Timeline_of_human_evolution
http://en.wikipedia.org/wiki/Evolutionary_history_of_life
http://en.wikipedia.org/wiki/Human_evolution
Most of the stuff is referenced too.