[url=https://www.bungie.net/en/Forum/Post/121194796/0/0]Evolution Explained[/url] [url=https://www.bungie.net/en/Forum/Post/107701125/0/0]evidence for evolution[/url] That's two posts I've made on the subject. Evolution is simply a change in gene frequency across a population of organisms. When a population of organisms gene frequency has changed to the point where they can no longer produce fertile offspring with others, then speciation has occurred, and we have a new species. The difference between the new species and the one it diverged from, will be minimal. However as this process continually occurs due to a multitude of reasons over millions of years, the consistent branching out, as well as often the extinction of the parent species, will results in a very diverse biome. Some examples http://blogs.scientificamerican.com/science-sushi/evolution-watching-speciation-occur-observations/ http://www.talkorigins.org/faqs/faq-speciation.html I go over evolution pretty thoroughly without being too long winded in the threads I linked. So if if you have a question, see if I've already addresses it there. But please, if you have a question or need further clarification, ask.