During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen. These sugar molecules are the basis for more complex molecules made by ...

The gas exchange system is responsible for getting oxygen into the blood and removing carbon dioxide as a person breathes ... enters our body through the mouth and nose. It travels down the ...

Sufferers have difficulty breathing, which reduces their blood-oxygen levels and can raise carbon dioxide levels (a condition ... mask that goes over the nose and/or mouth. NIV was originally ...

Sucrose is the regular sugar you use in iced tea or in baking. It is made from carbon, oxygen, and hydrogen atoms. Carbon dioxide is made from one carbon atom and two oxygen atoms. The molecules of ...