How to Prove that the change in energy form is an adaptive behavior to the surrounding environment and not a forced one.

I think there's a possible reaction mode to prove. But I need a exist reaction example.

Aiming a certain density of a particular substance as target, the energy threshold required for a reaction in the forward reaction and the reverse reaction is different (we set the forward reaction energy threshold to be lower), when we make the reaction start to occur at one location in the container (rather than all locations at the same time), The forward reaction lowers the threshold of the reverse reaction or provides energy for the reverse reaction to occur. When we study the density of this particular substance, we will find that its density will fluctuate up and down the target density, and eventually towards the target density. Instead of just reacting the forward direction until the target density is reached.