Question

looking at the dam picture below, which of the following is a negative effect of building dams for hydroelectric power?
it produces large amounts of air pollution.
it causes immediate increases in groundwater levels.
it requires burning fossil fuels to generate electricity.
it can disrupt river habitats and force people and animals to relocate.

Explanation:

Hydroelectric dams can flood large areas, which disrupts river habitats. This flooding can also force people and animals living in those areas to relocate. Hydroelectric power does not produce large amounts of air pollution (it's a relatively clean energy source compared to fossil - fuel - based power), it does not require burning fossil fuels (the energy comes from water flow), and while it can affect water levels in reservoirs, the immediate increase in groundwater levels is not a typical major negative effect compared to habitat disruption and displacement.

Answer:

It can disrupt river habitats and force people and animals to relocate.