Fact 1: Infection can cause bodily tissues to swell.

Fact 2: Bacteria can cause infection.

Given the two facts above, answer the question "what can cause bodily tissues to swell?" with the following options: 
- gravity
 - chickenpox
 - bacteria
 - influenza
 - smallpox
 - viruses
 - skin tissue
 - weathering


 

   bacteria      