Which of the following stresses would most likely cause an ecosystem to respond by succession?

Idk what the "following stresses" are because there were no given options, but I would say a wildfire.

Wildfire is another episodic stress, usually causing a mass mortality of ecosystem dominants such as trees or shrubs and a rapid combustion of much of the biomass of the ecosystem. The stressor wildfire would most likely cause an ecosystem to respond by succession. Hope i helped :)

This type of galaxy is an approximately ellipsoidal shape and a smooth, nearly featureless image. they are the largest single star systems, in the universe and are built by the collisions of many smaller galaxies.