Question

which human activity can produce disruption of fish breeding habits, increase in mosquito population, and flood control?
construction of dams to produce electricity
habitat destruction that decreases beaver population
increased erosion due to improper farming techniques
overfishing in artificial lakes

Explanation:

Dams can disrupt fish breeding by blocking migration routes. Standing water behind dams can be a breeding - ground for mosquitoes. Dams are also used for flood control by regulating water flow. Habitat destruction of beavers doesn't directly relate to the given effects. Improper farming - related erosion and overfishing in artificial lakes don't cause all three effects.

Answer:

construction of dams to produce electricity