What are you doing when you are making sound A. You are causing photons to vibrate
B. You are causing a medium to vibrate
C. You are causing the air pressure to drop
D. You are causing electromagnetic waves to radiate

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.