It takes in oxegen and takes off carbon dioxide
the respirtory system is its own system.
because they need to breath!
I believe that the three systems are; Respirtory, Digestie, and Circulatory.
the
lungs.....
Smoking and asbestos
It brings oxygen to the body.
between the nasal passages and the diaphragm
It takes in oxegen and takes off carbon dioxide
the cardoi does the workout.
The system that involves the esophagus, lungs, etc. and makes it so you can breath.
A shark obtains oxygen from the water using its gills.