What does the term 'gaseous exchange' mean in relation to the respiratory system?

Match the following. 1. an excellent source of vitamin c and vitamin a sucrose 2. linked to increased immunity and the destruction of toxic substances within the body vitamin a 3. found in yellow and green vegetables and fruits 2 vitamin c 4. vitamin in maintaining good eyesight and the treatment of infection fiber 5. the type of sugar found in all fruits 1 vegetables 6. table sugar skin 7. to keep the digestive system working properly and guards against colon cancer 3 carotene 8. where most of the fiber and vitamins are found in fruits and vegetables fructose