Process:  - A tree produces seeds - The seeds are dispersed by wind, animals, etc - The seeds reach the ground - Grow into new trees - These new trees produce seeds - The process repeats itself over and over -   Perturbation hypothesis: suppose more people use electric heating happens, how will it affect More seeds are dispersed.  Does the supposed perturbation have an effect (direct or indirect) on the process?
The answer to this question is:
no