Biology, and Reductionism (The limitations of science)

by David Turell , Saturday, April 11, 2020, 01:06 (1686 days ago) @ xeno6696

It doesn't work with living organisms:

http://backreaction.blogspot.com/2020/04/what-is-reductionism.html

"A lot of people seem to think that reductionism is a philosophy. But it most definitely is not. That reductionism is correct is a hypothesis about the properties of nature and it is a hypothesis that has so far been supported by every single experiment that has ever been done. I cannot think of *any scientific fact that is better established than that the properties of the constituents of a system determine how the system works.

"To be sure, taking things apart into pieces to understand how they work is not always a good idea. Even leaving aside that taking apart a living organism typically kills it, the problem is that the connection between the theory for the constituents and the theory for the whole system may just be too complicated to be useful. Indeed, this is more often the case than not, which is why figuring out how an organism works from studying its components is not a fruitful strategy. Studying the living organism as a whole is dramatically more useful, so this is what scientists normally do in practice.

"But if you really want to *understand what an organism does and how it does it, you will look for an explanation on the level of constituents. Like this part sends a signal to that part. This part stores and releases energy. This piece produces something and does this to another piece, and so on. If we want to really understand something, we look for a reductionist theory. Why? Because we know from experience that reductionist theories have more explanatory power. They lead to new predictions rather than just allowing us to reproduce already observed regularities.

"Indeed, the whole history of science until now has been a success story of reductionism. Biology can be reduced to chemistry, chemistry can be reduced to atomic physics, and atoms are made of elementary particles. This is why we have computers today. But, again, this does not mean it is always practical to use a theory for the constituents to describe the composite system."

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"There are two different types of reductionism. One is called methodological reductionism, the other one theory reductionism. Methodological reductionism is about the properties of the real world. It’s about taking things apart into smaller things and finding that the smaller things determine the behavior of the whole. Theory reductionism on the other hand means that you have levels of theories where the higher – emergent – levels can be derived from the lower – more fundamental – levels."

Comment: Reductionism works in physics and other mechanical sciences but not in biology and does not give us the explanation of how life works or even why it should exist in a material mechanistic universe.