Renaissance composers use which of the following to create polyphonic texture

In this unit, it is mentioned that in order to enter into the field of photography, most jobs require at least a high school degree. since there is a possibility you can attain one of these jobs with just finishing high school, why do some people get an associates or bachelor’s degree?

Nationalist composers sometimes included in their compositions. a. spoken word b. improvisation c. folk melodies d. gregorian chant

Pierrot lunaire is considered what?