State various disadvantages of dams
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if you block a river with a dam you change the way the river will allow fish to migrate upstream, the flooding downstream that used to provide nutrients to fields along the river is less likely (this can be either and advantage or disadvantage).
if you block a river with a dam you change the way the river will allow fish to migrate upstream, the flooding downstream that used to provide nutrients to fields along the river is less likely (this can be either and advantage or disadvantage).
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