Physicists have a reasonable claim to their discipline being fundamental to all of science. After all, they deal with elementary particles and laws which make up our world. Disciplines like chemistry or biology ultimately have to resort to physics for their explanatory power.
Another view, and one which share, is that there are concepts that are more fundamental than physics. Take evolution as an example: It’s a more fundamental principle than anything in physics, because it holds in many imaginable universes that have different physics. It can be simulated in rules-based universes that share none of the physics of ours, as has been demonstrated by cellular automata. The same applies to many other concepts, which is also why they often apply to many different domains.
Nehaveigur 