Fact 1: Poison causes harm to living things.

Fact 2: Lead poisoning is one of the more common poisonings in birds.

Given the two facts above, answer the question "Which causes harm to living things?" with the following options: 
- rabies
 - Oxygen
 - deadly
 - HIV
 - Lead
 - Carbon
 - Nitrogen
 - toxins


 

     Lead    