Which of the following describes how the U. S. government changed from the Articles of Confederation to the Constitution? It changed from a parliamentary to a unitary system.

It shifted from a parliamentary to a federal system.

It evolved from a confederal to a federal system.

It evolved from a confederal to a unitary system.

ASAP

Which reason best explains why certain areas of southwest asia have low population density? a. the semi-arid climate makes farming difficult because it produces very little rainfall. b. the moist climate limits job opportunities because it reduces oil production. c. the semi-arid climate produces heavy rainfall that contributes to devastating floods. d. the moist climate reduces agricultural production by causing water shortages.