Fact 1: Competition may cause animals to fight towards members of their own species.

Fact 2: Humans are animals too.

Given the two facts above, answer the question "what species may be caused to fight each other by competition?" with the following options: 
- h2o
 - Lobsters
 - violence
 - pigeons
 - gases
 - omnivores
 - bullfrogs
 - humans


 

        humans 