You are presented with the question "What causes harm to living things?" and the following answer choices: 
- arsenic compounds
 - a pathogens
 - tapeworms
 - deforestation
 - deoxyribonucleic acid
 - Pesticides
 - cigarettes
 - fossil fuels

Now knowing that poison causes harm to living things and arsenic compounds are poisonous, choose the best answer.


 

 arsenic compounds        