You are presented with the question "what species may be caused to fight each other by competition?" and the following answer choices: 
- h2o
 - Lobsters
 - violence
 - pigeons
 - gases
 - omnivores
 - bullfrogs
 - humans

Now knowing that competition may cause animals to fight towards members of their own species and humans are animals too, choose the best answer.


 

        humans 