Match these scales with where their half steps fall.
Ascending
melodic minor
Half steps between scale
degrees 3 and 4; 7 and 8
Harmonic minor
Half steps between scale
degrees 2 and 3, 5 and 6
Natural Minor
Half steps between scale
degrees 2 and 3; 5 and 6; 7
and 8
Major
Half steps between scale
degrees 2 and 3, 7 and 8

Opposition of two melodic ideas is the  right answer 

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Musical notation is a system which is used to  visually represent music  pertaining to the ear  contend  with instruments or sung by the human voice through  the employment  of written, printed, or different symbols.in the western music tradition, the sound is represented in written form through musical notation.in musical notation, the pitch is indicated exclusively by the position of notes on the lines and spaces of the staff.