GRE Text Completion Question 898
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Source: Red
The same environmental process that long ago caused the original degradation of the forest ecosystem are acting as (i) _____ its rehabilitation; scientists therefore intend to try to (ii) _____ these processes in order to prevent future damage to the ecosystem.
| Blank(i) | Blank(ii) |
|---|---|
| A barriers to | D counter |
| B precursors to | E facilitate |
| C signals of | F exacerbate |