Standards are different to theories. No one is here arguing about the existance of an agreed concept called weight. That would be a whole different argument
Actually theories do get made up as you go along - that's the whole point of research (scientific and otherwise). If your theory stacks up with the rest of the community & available data, it may stand for a while.
Any of those evolved forms of life will decay or move towards a disorderd state. Indeed it may seem strange that we see order all around us when the natural state of things is disorder. You could if you wanted to, think of life as a struggle against disorder. Go look at some non linear modelling, fractal theory or chaos theory for a view into this.
I'd be more than happy to review my understanding of the second law of thermodynamics but am pretty sure it won't shoot the idea of evolution down. Or else a lot of physicists have missed that link. How could they be so stupid, unless.....