Why do many musicians wear ear plugs during their performances even though the intensity of the sounds produced is lower than the threshold of pain?

The shift of a vehicle's weight around its center of gravity is known as

According to the cladogram, which organisms have roundworms as a common ancestor?

The fascicles of the deltoid are ; the fascicles of the pectoralis parallel; bipennate fusiform; unipennate multipennate; triangular bipennate; fusiform