The answer would be conflict.
Leadership, without a person to go give commands people won't know what it is their supposed to do.
Answer 2 is the right answer if this is in 4/4
The one vibrating faster if you think about when singing in order to hit high notes you must push air faster while when singing lower you slow down the speed o air being pushed its the same with high pitch Nd low pitch frequency higher equals faster and lower equals slower