Fact 1: Poison causes harm to living things.

Fact 2: Rattlesnakes can inject poisonous venom.

Given the two facts above, answer the question "What causes harm to living things?" with the following options: 
- toxins
 - HIV
 - Alcohol
 - food
 - A drug.
 - air
 - water
 - venom


 

        venom 