What is the best ingredient of a PB&J?

Where does the wood yiri come from? i know it is somewhere in africa but a specific location, . worth 15 points hurry

Which of the following describes the multimedia era? a. an era in which artists created works using paint software such as photoshop, without actually programmingb. an era of interactive technology where 3-d computer graphics were used to create a virtual environmentc. an era in which most of the computer art work centered around computer programming

In a paragraph of no less than 125 words, explain the single most important factor involved in advancing american classical music in the twentieth century.