In restoration ecology, why might it be challenging to return a damaged ecosystem to original its state/function? Why do scientists often select watersheds as an area to study energy and matter flows in'ecosystems?

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Answer:

in order to restore a damage ecosystem, to sow native seeds or transplanting individual plants is a first step towards the solution.

2. Because it is difficult to study biogeochemical cycles globally, it is important to research in a smaller scale in order to measure the ecosystem  processes.

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