Interdependence is a relationship between independent objects or groups. It is also when two nations depend on each other for trading. The modern cultures depend on cats to keep down rodent and insect population. We also depend on them for love and companionship as well as entertainment. Cats can be used as therapy animals for the elderly and sick children, and by petting a cat, you can lower blood pressure and stress. House cats depend on humans for love, care, and companionship. That is what cats have to do with interdependence.