Answer:
Nutrients
Step-by-step explanation:
The oxygen gotten from the respiratory system through inhalation combines with the glucose gotten from the food we eat (digestive system) to create nutrients for the body (circulatory system).
The oxygen from the inhalation helps in the cellular breakdown of food particles which results in the production of glucose which is a form of nutrients needed by the body for its daily activities.
These are 3 ways that these three systems work together