Why is the amount of water that goes over Niagara Falls today only about half as much as went over the falls a century ago?

Applying main ideas head 1-veto, make appointments head 2-override, ratify treaties, impeach head 3- declare laws unconstitutional look at the chart and answer the following question. which of these heading could best replace head 2 in the chart? a. presidential checks c. judicial checks b. congressional checks d. amendment process select the best answer from the choices provided