In the sequel, Starscream was nice enough to point out that Transformers are "born" and need energon to survive. Now, completely ignoring the reproduction aspect, as that's a whole nother discussion, I want to know what makes them grow? Is Energon the only thing? Do they need raw materials? Or more importantly, why do some Transformers seem to stop at Human Size or smaller while others grow to be Devastator sized? I know it is kind of hinted at with the Twins upgrading from 1 vehicle to 2. They obviously "grew" at that time in order to make 2 vehicles. As The Fallen and Jetfire proved, it has nothing to do with age either, as they were the same size as Optimus. However, both were much older than him. I also wonder, do Transformers decide when they want to quit growing? And, as has been speculated with the whole Constructicons debate, there seem to be several different "breeds" of Transformer, which makes sense, as the larvae that slips out of its birth juice onto Starscream's shoulder is probably bigger than Frenzy or Alice. That makes me think that Frenzy, Alice, and Wheelie all come from a smaller breed that have smaller larvae. Obviously, their size would pretty much rule them out as potential soldiers as the war goes on. So the few we have seen so far were probably around before the war began and were allowed to survive for espionage. So one has to think that the Decepticons are trying to breed a "superior" race of Transformer for their army, which is strikingly similar to something that happened here on Earth.... Your thoughts?