_______18. These are smooth movement repeated and again. It is an important principle of art. It is created by repeated use of the design a. Balance b. Proportion c. Rhythm d. Emphasis _____19. It is a practical combination of art and science that's used to determine what colors look good together. a. Color wheel b. Color theory c. Color combination d. Colorful
_____20. These are sources of all colors, they are all made up of these colors - red, blue, and yellow a. Primary colors b. Tertiary colors c. Intermediate colors d. Secondary colors​