It delivers oxygen throughout the body

• This makes it the most abundant element, by mass, in the body. Much of that oxygen is part of water, H2O. 
• Although there are more hydrogen atoms in the body than oxygen atoms, they account for significantly less mass. 
• Oxygen is also the most abundan...

Photosynthesis in plants takes care of the production of most of the oxygen.

Plants make use of sunlight, water and carbon dioxide to produce glucose and oxygen, which is used by animals(respiration and consumption of plants). Oxygen is then removed from the atmosphere by the process of d...

Oxygen gas is colorless, odorless, and tasteless. 

It's usually purified by fractional distillation of liquefied air, but the element is found in many compounds, such as water, silica, and carbon dioxide.