Given the question: Fact 1: Abreathing mask is used for keeping harmful particles from entering the respiratory system. Fact 2: Air pollution is caused by the build-up of harmful gases and particles in the air. Given the two facts above, answer the question "What does a gas mask keep out?" with the following options: - disease - The atmosphere - heat energy - air pollution - energy barrier - Bodily water - Dehydration - bacteria
The answer is:
air pollution