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.

a new predators are introduced to control a pest population.

Explanation:

An ecosystem is a biotic community in which the living beings interact with their non-living physical environment and among themselves so as to sustain their lives.

Among the options given the ecosystem is most likely to return to its' original condition after pest infestation when new predators are introduce to control these pests. The ecosystem will come back to the stable state after the pests are irradicated.

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.