In what way was the Sapa Inca more powerful than Mayan and Aztec rulers

Pollution from a factory that produces cleaning products is an_

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 happens after a star goes supernova? just wondering! [tex]supernova [/tex] answer asap i really wanna know!