[DOC] [TLE] Which elements make up the air we breathe? | Reference.com [PAR] Air is made up of oxygen, nitrogen and carbon dioxide. It consists of 
approximately 78 percent nitrogen, 20 percent oxygen and trace amounts of 
carbon... [DOC] [TLE] What is the gas that makes up about 21 percent of the atmosphere ... [PAR] What are the ingredients in the air we breathe? A: The air humans breathe is 
made up of about 78 percent nitrogen, 21 percent oxygen, and 1 percent carbon
... [DOC] [TLE] The Air We Breathe [PAR] What is in the air that we breathe? ... Atmosphere is 21% oxygen = 210000 L per 
1000000 L of air .... The fact that elemental composition (chemical make up). [DOC] [TLE] The air we breathe - Bo-Tau [PAR] The air you breathe comprises three main gases. The largest proportion ... 
making up 21 percent and carbon dioxide just 0.03 percent. Once it has found its 
way... [DOC] [TLE] What is Air Made Of? - Your Lungs and Breathing - Explore Your ... [PAR] The air you breathe is made up of lots of other things besides oxygen! Oxygen 
only makes up about 21% of air. About 78% of the air you breathe is made up of... [DOC] [TLE] The Air Around Us Flashcards | Quizlet [PAR] Start studying The Air Around Us. Learn vocabulary, terms, and more with 
flashcards, games, and other study tools. ... It makes up 21% of the air we breathe
. [DOC] [TLE] Air We Breathe [PAR] Purpose: To construct a model and understand the composition (make-up) of 
Earth's ... The air we breathe is approximately 78% nitrogen, 21% oxygen, and 
the... [DOC] [TLE] Did you know that the air we breath is only 21% oxygen.? | Yahoo ... [PAR] Oct 12, 2007 ... Here are 10 gases that make up clean air: In order of highest to lowest 
concentration they are Nitrogen, Oxygen, Argon, Carbon dioxide, Neon,... [DOC] [TLE] What Is Air Made of? | Wonderopolis [PAR] After all, you breathe in and out hundreds upon hundreds of times each day. ... 
assume that air is mostly made up of oxygen, since that's what our bodies need 
so desperately from the air we breathe. ... Oxygen accounts for about 21% of air. [DOC] [TLE] what gas's make up air  Cells Zone [PAR] Nov 19, 2012 ... The air that we breathe is mostly made up of nitrogen (78%). 21% is oxygen 
which is needed for animals and humans in respiration and 0.03%... [DOC] [TLE] If the air is 78% nitrogen and 21% oxygen, why do we say we ... [PAR] We breathe in everything, whether it's good, bad or useless. If it's a gas or 
suspended ... hemoglobin on red blood cells (it's what makes them red!) and is 
then carried through the body, where it plays an important role in cellular 
respiration. [DOC] [TLE] The Air We Breathe: Earth's Atmosphere [PAR] The Air We Breathe: Earth's Atmosphere ... The Greenhouse Effect makes the 
Earth ~35C warmer than it would be ... 21% O2. 1% H2O (Water Vapor). 0.93% 
Argon. CO2 (0.038%). Traces of. CH4 (methane), ... 5.6km you go up in altitude. [DOC] [TLE] Oxygen Facts - Air, Gas, Atom, Uses, Properties, Water, Ozone ... [PAR] Oxygen is essential to human life, it is found in the air we breathe and the water 
we drink (H20). Oxygen makes up around 21% of the air you breathe. It is also... [DOC] [TLE] Universal Industrial Gases, Inc: Composition of Air - Components ... [PAR] We breathe it with hardly any conscious thought. ... "Air" is the name we give to 
the mixture of gases which make up the Earth's atmosphere. ... mainly composed 
of three gases: nitrogen (about 78%), oxygen (about 21%), and argon (about 1%)
. [DOC]

Question: It makes up about 21% of the air we breathe
Answer: oxygen