question: what exists between dogs and humans?
choices.text: mutualism gravity communication antigens several genes space between electrons german shepherd
choices.label: A B C D E F G H
fact2: Dogs and humans are symbiotic species.
combinedfact: mutualism exists between dogs and humans
formatted_question: what exists between dogs and humans? (A) mutualism (B) gravity (C) communication (D) antigens (E) several genes (F) space between (G) electrons (H) german shepherd