How is ones behavior determined? Is it like an animals by genes or physical characteristics. A person's behavior is almost always determined by his/her surrounding environment. Physical characteristics and traits do not determine his/her behavior this is the definition of stereotyping not the root of a person's behavior. When a person adapts to his/her surroundings ie country they are able to live in that area to their best capability and achieve best results rather then not adapting and not using their surrounding to their advantage. Adapting does not necessarily mean changing ones ways but embracing that country's d