The Maya and the Aztec took advantage of the swampland throughout Mesoamerica. What is the main reason both of these cultures found the swamps useful? Select the best answer from the list below.

1.The swamps were a way to keep their enemies from reaching their cities.

2.The swamps were a source of fresh water.

3.The swamps could be drained and used to build houses on.

4.Animals that could be used as food lived in the swamps.

An externality can be created by a. people working at a production job and enjoying their work b. a production activity but not a consumption activity c. a consumption activity but not a production activity d. a production activity or a consumption activity externalities a. are always positive, and an example is flu vaccinations b. are always negative, and an example is the pollution created by trucks c. can be negative or positive. logging has a negative externality, and education has a positive externality d. can be negative or positive. a negative externality is having to go to school when you would rather go to the beach, and a positive externality is spending time with your friends

What is it called when countries build lots of weapons to store and them in case of a war?

Which of the following did the founding fathers see as a benefit of the federal structure (federalism) of government? a.) all power is concentrated in the national government. b.) the power is divided between national and state governments. c.) all the power is concentrated in the state and local governments. d.) the power is divided between the people and the government