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 less coal is put in a coal-fired steam station happens, how will it affect LESS forest formation.  Does the supposed perturbation have an effect (direct or indirect) on the process?
Answer:
no