An ecosystem is most likely to return to its original condition after which of these occurs? a new predators are introduced to control a pest population. b a marsh is filled in to make space for a new parking lot. c tall prairie grass burns after being struck by lightning. d flood waters erode the banks of a narrow stream.

This is when new predators are introduced to control a pest population. This is because pests when they attack an ecosystem, they degrade it by feeding on available food for other biodiversity. Also, these pests do attack some crop yields leading to low production. Therefore when new predators are introduced, they will reduce these pests leading to regaining of the original state of the ecosystem.