How does the upper respiratory system support good health?

by moistening, heating, and purifying air as it proceeds down the airways

by removing dangerous carbon dioxide gases built up in the tissues

by providing oxygen to the cells

by preventing people from swallowing air

That is pretty  

1. b vitamins2. vitamin k3. vitamin d4. examples are walnuts, seeds, tofu5.  total fat, saturated fat, trans fat, cholesterol, sodium, total carbohydrate, dietary fiber, sugars, protein, vitamin a, vitamin c, calcium, and iron.6. 11257. they have to contain reliable information8. less than 10%  9. i didnt read the course so im not surehope that : p

The answer is sensory neruon

The answer is "false". improved balance is not a primary benefit  of regular cardiovascular exercise.