The answer is the endocrine system.
The brainest answer would be apprenticed.
Initial conditions and chance play roles in the process of succession so if the ecosystem is in a good condition and chance is on it's side (no natural disasters or human interventions occur), succession can't happen because there is no destroyed area to build new upon.
I do not agree, only because there have been so many children to play with toys like that, and they have been perfectly fine, so its like a one out of million chance.
