What are the concentrations of H,0+ and OH in oranges that have a pH of 3.91?

Gymnast always perform on padded mats. how does the mats protect the gymnast

What was bohr’s contribution to the planetary model

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.