Answer :
The citizens of a rural community have gathered for a meeting to discuss the building of a dam on a nearby river. Many support the dam for various reasons, but a few have voiced concerns about its long-term impacts. The concern that is not the probable impact of building a dam is the introduction of invasive species. So the correct option is b.
Dams alter habitat. Dams change the way rivers function. They can trap sediment, burying rock riverbeds where fish spawn. Large dams have led to the extinction of many fish and other aquatic species, the disappearance of birds in floodplains, huge losses of forests, wetlands, and farmland, erosion of coastal deltas, and many other unmitigable impacts. Disrupted and altered water flows can be as severe as completely de-watering river reaches and the life they contain.
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