You can say everything is brain biology, brain state and brain process.
My perspective is you can develope theory of mind a little more. A lot of what we discuss here can fit a universal form like this:
Physical brain; (abstractions)
Physical brain; (concepts)
Physical brain; (sensing physical environment)
Physical brain; (muscle control)
Physical brain; (thinking)
Physical brain; (ideas)
Physical brain; (knowledge)
Physical brain; (information)
Physical brain; (consciousness)
Physical brain; (language)
Physical brain; (mathematics)
Physical brain; (science)
Physical brain; (philosophy)
Physical brain; (non-physicals)
Physical brain; (time perseption)
Physical brain; (visualizing)
Physical brain; (manipulating physical matter)
Physical brain; (manipulating non-physicals)
Physical brain; (how to communicate)
Physical brain; (how to encode and decode physical matter)
On and on
The notation semicolon parentheses means such that the subject in the parentheses is supported by physical brain state.
Given in this form I think it's easier to understand the debate of monism or dualism.
Also things like the word information in language isn't something that can exist outside this brain supported form.