Construction of dams can have an impact on:

The correct answer is d) All of the above.

Dams can have a significant impact on river ecosystems, downstream water availability, and the displacement of people.

• Dams can disrupt the natural flow of rivers, which can have a negative impact on fish and other aquatic life. Dams can also change the temperature and water chemistry of rivers, which can further impact aquatic life.
• Dams can reduce the amount of water that is available downstream. This can impact agriculture, drinking water supplies, and ecosystems that rely on river water.
• Dams can displace people who live in areas that are flooded by reservoirs. This can have a significant impact on people’s livelihoods and way of life.

In addition to these impacts, dams can also have a number of other environmental impacts, such as greenhouse gas emissions, erosion, and landslides.