Describe how the respiratory system supports life.

Explanation:

The respiratory system allows for intake of oxygen, food 4 cells 2 absorb through the circulatory system.

once food is digested, it runs through the circulatory system as glycogen, (sugars). cells can readily absorb glycogen bcause of the fact it has smaller molecules 4 cells to absorb, to give them energy to function normally. respiratory system and the pulmonary aorta, distributes through the heart, absorbs food 4 heart, and distribute glycogen 2 rest of body, 4 cells 2 absorb 4 energy... hope this is helpful..

answer; 4% i believe this is correct;

you may having too much sleep.. a good night sleep consists of about 7 hours. more than that could be the reason you're still tired throughout the day.