They all have instruments to "uncouple" oxidative phosphorylation from electron transport framework by giving an option system to protons to come back to the mitochondrial grid. As protons enter the lattice without going through ATP synthase, their vitality is discharged as warmth. So these produce warm by uncoupling those two procedures.
I did this in my class a year ago and as far as i remember it was in the 1700 but i think 1767 to be exact
The answer is osteoclasts
It would be lithium and nickel due to the electrons