question: howling is used to warn other what kind of animals 
choices.text: ecosystem animals humans weather travel sound social people
choices.label: A B C D E F G H
fact2: Like people, wolves are social.
combinedfact: howling is used to warn other social animals
formatted_question: howling is used to warn other what kind of animals  (A) ecosystem (B) animals (C) humans (D) weather (E) travel (F) sound (G) social (H) people