Building dams is a threat to fish because it takes away from their habitat and breeding grounds. Dams may also hinder their ability to migrate.
building houses or dams
beaver
dams
Building dams
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Dams disrupt a river's ecosystem.
the govt.
flooding
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The Chinese have built dams to prevent flooding.
By building dams - for example, the construction of the Aswan Dam in the 1960's meant that from 1970 the annual flood was controlled.