An oligopoly is: a.
fifteen to eighteen firms producing 90 percent of the output.

b.
one firm producing 95 percent of the output

c.
ten to fifteen firms producing 40 percent to 50 percent of the output.

d.
a few firms producing the majority of the output.

The picture below shows two galaxies. spiral galaxy and elliptical galaxy which of these statements best describes a similarity between the two galaxies? (2 points) both have elongated centers. both have centers shaped like bars. both change their shape from time to time. both are held together by gravitational forces.