You are presented with the question "What do mold spores make it hard to do?" and the following answer choices: 
- clean house
 - motility
 - kill them
 - breathe
 - reproduce
 - eat bread
 - play outside
 - survive

Now knowing that amold spore has a negative impact on the respiratory system and another name for the breathing tree is the respiratory system, choose the best answer.


 

    breathe     