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The Oxygen-Carbon Dioxide Cycle

The Oxygen-Carbon Dioxide Cycle
Reading Level
     edHelper's suggested reading level:   grades 5 to 8
     Flesch-Kincaid grade level:   7.51

Vocabulary
     challenging words:    chlorophyll, photosynthesis, protists, element, dioxide, carbon, fairly, nearly, important, amount, neither, world-wide, release, provide, percent, constant

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The Oxygen-Carbon Dioxide Cycle
By Cindy Grigg 		  
1     One element that is very important to nearly all living things is oxygen. Humans and other animals need oxygen to stay alive. Every time you take a breath, you are filling your lungs with oxygen.
 
2     If much of the oxygen in the air disappeared, animals would not be able to survive. But animals are breathing in oxygen every day. Why doesn't the air ever run out of oxygen?

Paragraphs 3 to 4:
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