Evolution mandates that humans evolved from something else - with perfect information, we would be able to trace our lineage all the way back to a single-cell organism. There's no scientific reason to believe humans are different from all other life on the planet, not given how much evidence there is to the contrary. (reproduction, cell function and so on)
DNA analysis is going to make this a lot easier to prove as it becomes cheaper to sequence the entire DNA. The more similar two species are in their DNA, the more recent they have diverged and therefore the closer related they are.
Chimps, Humans 96 Percent the Same, Gene Study Finds
edit: from the article
Quote:
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A comparison of Clint's genetic blueprints with that of the human genome shows that our closest living relatives share 96 percent of our DNA. The number of genetic differences between humans and chimps is ten times smaller than that between mice and rats.
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