The answer is indeed projection. :)
Ethnomusicologist. Why are you on the math section?
Answer:
Assuming there's only one answer, i'm guessing it's, A moving dot with a start and a finish point. Hope this helps! PLEASE GIVE ME BRAINLIEST!!!!! =)
Microphones. As communities grew and gatherings became larger, the challenge was to create a device that would allow everyone to hear the performers.