http://eschooltoday.com/science/needs-of-living-organisms/living-things-need-air-to-survive.html

Animals including humans need oxygen to live. We breathe in oxygen and breathe out Carbon Dioxide. There are also air pockets in soils and water that help ...

https://www.wonderopolis.org/wonder/why-do-we-need-to-breathe/

Daniel Wonders, “why do we need oxgen to live” Thanks for WONDERing with ... As you breathe in air, it travels through large tubes in your lungs called bronchi.

https://sciencing.com/minimum-oxygen-concentration-human-breathing-15546.html

Mar 10, 2018 ... Humans need oxygen to live, but not as much as you might think. The minimum oxygen concentration in the air required for human breathing is ...

http://scienceline.ucsb.edu/getkey.php?key=3097

Have you learned about how plants and animals live together? ... We make carbon dioxide and put it into the air (when we breathe out, or exhale). ... oxygen is 21% but the minimum required for humans is about 17%, so only a little less than ...

http://sciencenetlinks.com/lessons/oxygen-machine/

... human beings perform the respiration process because we need air to breathe and because oxygen is ... What gas in the air is important for human survival?

https://www.vitalitymedical.com/to-air-is-human-why-your-body-needs-oxygen

Oxygen provides a basic building block for our bodies to survive. ... Oxygen is all around us in the air that we breathe, and that is a good thing because we ... the cells of the human body receive the oxygen that they need to properly function.

https://www.quora.com/Why-do-we-need-air

We don't need “air;” we need the oxygen that is in the air. The rest of the air is ... Air is necessary to breathe, to survive, and to create. We need air for our ... Originally Answered: Why do humans need air? Helps us breathe.

https://www.pressconnects.com/story/news/local/2015/01/10/humans-trees-vital-relationship/21551347/

Jan 10, 2015 ... As humans, we breathe in air, which contains oxygen. Oxygen is essential for us and all other animals to survive. Once we breathe in oxygen, ...

https://io9.gizmodo.com/how-long-would-you-survive-in-an-airlock-5861679

Nov 23, 2011 ... Many suspense and science fiction novels have characters locked in small, ... Every time they breathe in, they're taking in some oxygen and ... The exhaled breath of a human being has roughly five percent carbon dioxide.

https://www.youtube.com/watch?v=LM_CgtFORzw

Oct 2, 2014 ... Everyone breathes, but why is oxygen important? Whether the topic is popcorn or particle physics, you can count on the HowStuffWorks team to ...