Which style of music use two or more individual melodic lines at the same time

polyphony

Explanation:

i took the test

the answer would be (b). the stave church in borgund, norway is an example of norse architecture.

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.