Fact 1: Bacteria cause food to spoil.

Fact 2: Water can be tested for coliform and fecal coliform bacteria.

Given the two facts above, answer the question "What causes food to spoil?" with the following options: 
- contamination
 - influenza
 - coliforms
 - toxins
 - disease
 - Dehydration
 - Pollution
 - Pesticides


 

   coliforms      