, the __oxygen (respiratory system) combines with the glucose from the food we eat (digestive system) to create for the body (circulatory system). These are 3 ways that these three systems work together

Nutrients

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

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.