This variation is an example of disruptive selection. The other choices given in the question are incorrect and can be easily neglected. The correct option among all the options that are given in the question is the fourth option or the last option. I hope that this is the answer that has come to your desired help.
Primary succession is much slower than secondary succession because it begins where there is no soil. It can take several hundred to several thousand years to produce fertile soil naturally. The first pioneer species to colonize the bare rock will probably be bacteria and lichens, which can live without the soil.
An imbalance in blood glucose levels causes "C. diabetes" although is should be noted that it takes a prolonged and special kind of imbalance. Brief imbalances won't cause diabetes.
Typically, it takes between 500 to 1000 years for a primary succession to reach a climax community.
A primary succession usually begin in bare place with may be only rocks or soil while a climax community is a mature community that signifies the end of growth of a community. It takes year for a primary succession to become a climax community.<span />
