Fact 1: Pathogens can cause disease.

Fact 2: This suggests the pathogen may be moved through the air somehow.

Given the two facts above, answer the question "How can diseases be trasferred?" with the following options: 
- Getting a vaccine
 - By studying it
 - radiography
 - In the air
 - Looking at it too closely
 - anemia
 - chickenpox
 - influenza


 

    In the air     