The theory of ________ reached its peak in works such as The Portuguese

Some twentieth century music has no tonal center

a. true b. false

Meghan and Kurt have been a couple for 10 years. There have been a few rough patches where their differences in interests caused them to think about breaking up, but they stuck together. Meghan began thinking about having children. Kurt had not been sure if he wanted children but finally decided to propose to Meghan, reluctantly, and get married before starting a family. Their relationship seems to have followed a(n) ______ trajectory.

Fill in the blank(s) with the appropriate word.