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How does a dam and pesticides decrease salmon communities?​

User Qwertzman
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Answer:

Dams are barriers to juvenile salmon migrating to the ocean, and an obstacle as adult fish return to their natal streams to spawn. And pesticides can make their way into waterways through run off. When these pollutants reach creeks, streams, and rivers, they can impair reproduction, stunt growth, and even kill fish

Step-by-step explanation:

User GuillermoMP
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