You're not completely wrong, but you're also not completely right. Remember, simply selecting for best fit individuals is not evolution, that's natural selectio

You're not completely wrong, but you're also not completely right. Remember, simply selecting for best fit individuals is not evolution, that's natural selection. Furthermore, reproduction introducing new variants is also not, on its own, evolution, that's descent with modification. Evolution only occurs when you've got descent with modification and natural selection working together to push species toward one niche or another. Certainly evolution can stop. Take, for example, dinosaurs! Of course, extinction is an extreme case. So can an existing species stop evolving? For better or worse, the answer depends on a concept which is still not fully resolved: neutral evolution. The general idea of neutral evolution is that, even when you're not selecting for one variant or another, introducing new variants will make you better fit for the next selection event (presuming you subscribe to the punctuated equilibria views). Essentially, you might not be evolving now (i.e. no selection pressure exists), but you might be stacking the deck to evolve better in the future. ...confusing, right? I love this stuff! :-)