Re: Some Female Lizards in the Wild
"...entirely clones. I've never understood how that can work in the long term." --- Mage
Although sexual selection does seem to offer some benefits, it is absolutely not a requirement for reproduction or evolution. If you are wondering how anything can actually evolve in the absence of sexual selection, well, mutation provides much of the heritable variety in large groups of organisms.
It's been a long time since I was a geneticist, but certainly when I was, it was not entirely clear what the specific advantages of sexual reproduction were (although it was clear there must be some). I think there are some reasonably hypotheses now. The Wikipedia page seems to be of a reasonable quality (in common with much of the scientific content) if you're interested.