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

Yes, c.

it is c I just took the test.

Yes, you are correct. The impact of a dam on the environment includes causing changes in the river ecosystem. Dams can alter the flow of the river, impacting the habitat of aquatic species and the overall health of the ecosystem.

Yes, you are correct. The best description of the impact of a dam on the environment is that it causes changes in the river ecosystem. Dams alter the natural flow and characteristics of rivers, which can have significant effects on the surrounding environment. The construction of a dam typically involves flooding large areas, which can drown habitats, displace wildlife, and alter the natural landscape. The changes in water flow caused by the dam can also disrupt the river's ecosystem, affecting fish populations, altering sediment transport, and potentially leading to the loss of biodiversity. It is important to consider these ecological impacts when implementing dam projects.