Given how evolution seems to work in practice - building beings out of discrete organs and they scale up/down to an optimal size depending on conditions - I'd e

Given how evolution seems to work in practice - building beings out of discrete organs and they scale up/down to an optimal size depending on conditions - I'd expect that this will hold for most things. I'm not nature, but the low-entropy way of building these systems would be to have biological equivalents of variables that control the size (and probably shape) of different features. That would be an evolutionary advantage, because species with genomes organised that way would be amenable to evolving into local optimums. To rephrase; evolution works best when there is a small area of the genome where tiny changes have large impacts on the size of an organ without altering its function.