Which of the following could result in secondary succession?

The possible answers are

a. the formation of a tall sand dune on a previously grassy beach

b. a vast glacier in motion forming a U-shaped valley on its wake

c. a volcanic eruption that covers most of what used to be a forest

d. an introduced species that devastates native plants as it feeds

The correct answer is D

Secondary succession is an ecological process that happens when plants colonize a new habitat.

In primary succession, plants colonize a completely new, barren land with no soil present.

In secondary succession, the colonization happens in a habitat that has already been populated by plants and other forms of life, but the habitat has been damaged in some way that led to the opening for a place in the habitat for some new organisms.

In our example with the introduced species, the devastation of the native plants opens a space in the ecosystem for other forms of life to take their places.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.