How was engraving believed to have originated

Natural 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 ascending melodic 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

Expectations relate to future schooling in that you can

Which of the following artists is known as the “father of pop art”? a. andy warhol b. norman lewis c. richard hamilton