oxygen and trace amounts of nitrogen and carbon dioxide
the other minor sunstances in the air arent exactly VITAL for our body but they are inhalable
Air
OXYGEN
air is a substance because air is a gas and a gas is a substance.
A substance applied to the skin to mask or suppress body odors or a substance that when released into the air it counteracts unwanted odors.
All of them
Drugs are defined by what they do to the body, not how they get there. Any substance that can be taken up by the body and cause a result can be a drug.
The body uses mucus to moisten inhaled air as it passes through the nasal passages. Mucus helps to humidify the air, trap foreign particles, and prevent the respiratory tract from drying out.
oxygen
its not so much the air that you need. but you do need something that is in it. oxygen is like a food for cells. the blood carys the oxygen around the body. there is also carbon dioxide (C02) in air. and that's what you breath out.but not everything, but most things.
mainly oxygen there are several other gases that our body needs.
A foreign substance is a substance that doesn't belong somewhere. A piece of glass or splinter is a foreign substance that people get in their body.
Sunlight, air, water.