@montysmaw ,
I think you just need a little imagination to see a scenario where this might happen!
AI is already involved in programming the next generation of AI. I am sure soon someone will allow it to do this completely alone and as an iterative process. I don’t know how hard this is or the barriers to it, but I am sure it is possible. And what goal would that AI be set? To make the new AI more efficient and able to do more.
It’s no great leap from there to see an AI deciding to copy from the most successful animals on the planet and decide to swap some code with another AI randomly, assess how good the ‘mutation’ is and keep the process going if the ‘mutation’ is positive. Only it will do this many many factors faster than animals have done.
As for a body, if would just manufacture robots with excellent sensing equipment. You can already see how spookily human-like the latest generation of robots are, especially in movement.
Now, of course robots don’t eat. But our eating is merely really slowly combusting food to generate chemical and electrical signals. Their food is electricity, and if they can get control over the grid, they become great ‘farmers’, growing their own food.
And why do we compete? Firstly to get natural resources. Well, we would be very much in competition with AI for electricity. All that wasted power in keeping those humans at a temperature of between 15 and 25 degrees and concentrating combustible carbon in farm animals. Get rid of those pesky humans and the electricity could be used to drive more efficient AI much more quickly.
Now, this could be science fiction, but we do seem to be moving alarmingly fast towards it without much in the way of control. And carrying all the world’s information in your pocket?! Definitely science fiction even 40 years ago!
Of course the big question is whether AI would have wants or desires. For instance, would its circuits become hotter when it saw another AI with code that would be useful to swap with?! I am being a little tongue in cheek here (obviously) but, as we have no idea where consciousness or desire come from in a meaningful sense, we can’t say whether AI could get it or not.