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.

in november 1781, john hanson became the first president of the united states in congress assembled, under the articles of confederation. many people have argued that john hanson, and not george washington, was the first president of the united states, but this is not quite true.

explanation:

i believe the answer is d.