What+is+Oxygen


 * __What is Oxygen:__**

It was discoverd in the late 18th century that 21 percent of the atomsphere is oxygen. Oxygen is the support of our life. Without oxygen, us humans wouldn't exist. Oxygen has no smell, no taste, and it is not visible. Plants is one of the ways that oxygen is made. In the day, plants inhale carbon dioxide and exhale oxygen. At night, its the other way. At night, plants inhale oxygen and exhale carbon dioxide. Animals also do the same things as plants. Exhale oxygen in the day and inhale oxygen at night. These are just a two ways that oxygen is produced.

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