Question

what is the use of o2 in body​

Answer 1

Answer:

Oxygen, through a process called oxidation, chemically changes food and liquid into energy. It's this "oxygen fire" that contracts our muscles, repairs our cells, feeds our brains, and even calms our nerves. Not only that, but breathing is our body's chief cleansing tool.

Answer 2

Answer:

see this photo 1 by 1

Explanation:

these is your answer