Full Idea
Philosophers have often invoked multiple realisability to explain why psychology cannot be reduced to physics or chemistry, but in principle the explanation works for any higher-level science.
Clarification
'Multiple realisability' is implemented in many ways
Gist of Idea
Multiple realisability is said to make reduction impossible
Source
Samir Okasha (Philosophy of Science: Very Short Intro (2nd ed) [2016], 3)
Book Reference
Okasha,Samir: 'Philosophy of Science: very short intro (2nd ed)' [OUP 2016], p.52
A Reaction
He gives the example of a 'cell' in biology, which can be implemented in all sorts of ways. Presumably that can be reduced to many sorts of physics, but not just to one sort. The high level contains patterns that vanish at the low level.