But what means incomplete in these cases? All of these aren't theories that claim to explain everything. Maxwells theory explains classic electro-magnetism. And it does that complete. Likewise, we know the limitations of both the theory of relativsm and the quantum theory.
With the chemistry example I just wanted to say, that you could use a different theory to talk about the same things. Especially if you can abstract from the underlying theories. Often we are even unable to show how a higher system interacts exactly with the underlying ones. It is difficult to impossible in biology and even more so in psychology and sociology. Everything has to just follow the simple laws of physics, but the systems that are build by them are to complex to be described this way. It is much more simple to use theories custom made for these fields.
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