All Living Things Need Oxygen
Every living thing on earth needs energy to survive; this energy comes from food. Although some forms of life (like plants) can make their own food, most living things need to eat food to get energy. Once the bodies cells have taken up the food molecules, they need oxygen to get the energy out.
You may already know that humans use lungs to get oxygen, but do you know how other living things get their oxygen? Click on the different organisms below to see how the different living things on earth are able to get the oxygen they need.