Push-and-pull factors contribute to
economics
politics
migration
education

c) migration

Push factors are the reasons why people leave an area. Pull factors are the reasons why people move to a particular area.

technology is the collection of techniques, skills, methods, and processes used in the the merriam-webster learner's dictionary offers a definition of the term: "the use of moreover, these technologies have become so complex that entire fields more recently, modern works of science fiction such as those by philip k.

explanation:

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up