The answer is <span>punctuated equilibrium.</span>
Primary succession occurs following an opening of a pristine habitat, for example, a lava flow, an area left from retreated glacier, or abandoned strip mine. In contrast, secondary succession is a response to a disturbance, for example, forest fire, tsunami, flood, or an abandoned field.
It is the enterogastric reflex. The enterogastric reflex is one of the three outward reflexes of the gastrointestinal tract, the other two being the gastroileal reflex and the gastrocolic reflex. The enterogastric reflex is fortified in the duodenum by a pH of 3-4 and in the stomach by a pH of 1.5.
