What happens to the atomic mass of the elements moving from left to right within a period? A. The atomic mass stays the same within a period.

B. The atomic mass fluctuates throughout the period.

C. The atomic mass decreases.

D. The atomic mass increases.​

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.