Question

secondary succession occurs
o after a new food web is established.
all of these are correct.
o as one generation of organisms replaces the previous one.
o as a previously existing community is replaced.

Explanation:

Secondary succession is the ecological succession that occurs in an area where a previously - existing community has been disrupted. It can involve the replacement of one generation of organisms by another as the community structure changes. Also, as the succession progresses, a new food web can be established. So all the given statements can be associated with secondary succession.

Answer:

All of these are correct.