You are presented with the question "What has a negative impact on the lungs?" and the following answer choices: 
- unpolluted air
 - healthy atmosphere
 - mold spore
 - smoking
 - disease
 - influenza
 - clean air
 - A virus

Now knowing that amold spore has a negative impact on the respiratory system and major components of the respiratory system are the lungs, trachea, nose, and the cell, choose the best answer.


 

   mold spore      