You are presented with the question "A mold spore has a negative impact on what?" and the following answer choices: 
- vehicles
 - humans
 - breathing
 - gasoline
 - dirt
 - disease
 - rocks
 - cells

Now knowing that amold spore has a negative impact on the respiratory system and respiratory symptoms include difficulty breathing, wheezing, and stridor, choose the best answer.


 

   breathing      