Pick from:
A). toxins;
B). HIV;
C). Alcohol;
D). food;
E). A drug.;
F). air;
G). water;
H). venom;

Fact 1: Poison causes harm to living things. Fact 2: Rattlesnakes can inject poisonous venom. Given the two facts above, what causes harm to living things?
Answer:
H).