Fact 1: Eating food that contains pesticides can have a negative impact on humans.

Fact 2: Pesticides are chemicals that kill pests.

Given the two facts above, answer the question "Eating food that contains what can have a negative impact on humans?" with the following options: 
- vitamins
 - antioxidants
 - Abnormal cell growth
 - pest-killing chemicals
 - Something that causes allergies
 - harmful substances
 - minerals
 - a pathogens


 

    pest-killing chemicals     