7. Which statement best describe an interaction between circulatory and respiratory system that helps maintain a stable internal environment?
A. Blood cells pick and carry oxygen from the lungs to the body cells.
B. The diaphragm and rib cage work together to move air into and out of the lungs.
C. Blood plasma transports salt, sugar, fats, and dissolve proteins through the body to keep it healthy.
D. The lymphatic system collects and returns fluid that leaks from the blood vessels.​