Well, evolution is a very slow process. Things evolve to adapt to the environment they live in. Evolution can be looked at kind of like...birth defects. I guess a better word would be a genetic difference. When something is born with that "defect," It carries the gene along with it, and passes it along to whatever it breeds with. Through time and breeding, the trait becomes more and more common, and eventually is just a normal part of that type of animal. Of course, this process takes a very long time. I'll use an colony of people that starts living underwater as an example.

Ok, so just say a colony of people were to start living a lot of their lives underwater, but coming up every minute or so for air. Over generations, the people in the colony will be able to breathe for longer and longer amounts of time. This is their body's way of adapting to the environment.

It is the same way gills were created. Then, when animals developed legs and started coming onto land, they developed lungs, because that's what they need to get nutrients from the air.

I think that the reason not all apes turned into humans is the fact that they are so spread out. I'm not sure why we developed so much intelligence, but it makes sense because animals have been becoming more and more intelligent over time. Anyway, since not all apes were bunched together and not all bred with each other, the ones who were not around the ones who carried this new trait obviously did not get this new trait. You can see this in people too, as the first humans developed in Africa, they were black. Eventually, some of them started to move to colder climates, and the ones that did, developed lighter skin colors, making white people. There are still both whites and blacks living today, as there are apes and humans. Now, I am not exactly sure why the earlier versions of humans no longer exist, but my theory is that, like many species of animals, they became extincted. I think that at one time, the more primitive humans and the ones more like now co-existed.

Thats is about what I know about evolution. I hope I explained it clearly and that it helped. :thumbsup: :rastasmoke: