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Dams built across rivers have significant impacts. Which of the following is not an impact of dams?Valuable freshwater habitats, such as waterfalls, are lost.Dams block migrating fish from swimming upriver to spawn, even if fish ladders are installed.Downstream flooding, while rare, is more dangerous after a dam is built.Soil is prevented from going downstream, so sediments lost to erosion are not replenished.Sediment settles in the reservoirs, filling in the lakes and shortening their life spans.
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