3. What purpose do dams serve? Select all that apply. (2 points) They are used to provide electricity. They are used to trap and hunt animals. They help to prevent floods. They prevent people from navigating on rivers.

1 - They are used to provide electricity.

2 - They help to prevent floods.

Explanation:

In general, a dam is used to provide electricity using the power of the water. However, another importance (and purpose) is to prevent floods. Once it's building is carefully thought and executed, the deviation of the watercourses and to contain it in a single space is better to control, and avoid floods.

barack obama

44th president of the united states