science help pls pls

posted by Oscar

Dams are used to produce hydroelectric power. Which of these best describes the impact of a dam on the environment?

It causes air pollution.
It reduces the level of groundwater.
It causes changes in the river ecosystem.
It reduces the level of oxygen in river water.

is it c pls help me

  1. Ms. Sue

    Yes, c.

  2. alex

    it is c I just took the test.

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