Change in an organism over time.
Random mutations
Giraffes that grew a long neck got more leaves than others? I would assume? Of course, it's not as simple as simply growing a neck
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Two groups of organisms are separated and the genetic variety changed so much that they could not reproduce
Essentially a hypothesis that's been tested for a while.
Random mutation
Natural selection is change, where as SOF implies that anything that is not physically fit will not survive.
Being able to reproduce I think.
Mating two species and creating a new one? Random mutations?
Well, I'm homeschooled and I've never really taken an evolution class before, so I'm not sure if I got all those right
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I don't think the issue so much is whether creationists understand natural selection. I think most do, and simply don't think that it's probable that natural selection can account for what we observe today in only 1ba. It's hard to even find an observable change in which new information is added (not duplicated, added). For example, downsyndrome and bacteria digesting nylon, etc, only duplicate existing information.