According to ptolemy's model of the movement of celestial bodies, a. the sun is the center of the universe. b. the earth rotates around the moon. c. planets orbit in circular paths around the earth. d. the earth rotates around the sun.

Which of the following is a direct benefit of the use of assembly lines in production a. laws against theft fraud and coercion are needed to protect free choice. b. the government needs to plan efficient outcomes. c. competition among producers by itself cannot ensure a wide range of consumer choices. d. works pressure the government to guarantee minimum wages