Carbon Dioxide

Oxygen is a living element that humans and animals require to live. 

• True 
• False

Why is the CO2 and O2 cycle considered to be a cycle?

• there is a exchange of gases
• the trees use it and trees are apart of all cycles
• there is a continuous exchange of gases

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Which type of organism gets its energy directly from the Sun?

• producer
• consumer
• composer
• decomposer

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Which statement is true about the carbon dioxide-oxygen cycle?

• animals breathe in nitrogen and release oxygen which is used by plants
• animals breathe in oxygen and release carbon dioxide which is used by plants
• animals breathe in nitrogen and release carbon dioxide which is used by plants
• animals breathe in carbon dioxide and release oxygen which is used by plants

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If all the trees on Earth were destroyed, what would be the effect on humans?

• there would be a lack of food
• there would be a lack of oxygen
• there would be a lack of fresh water
• there would be a lack of carbon dioxide

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Animals and plants use substances that cycle through the environment.  Which substance is needed by plants to survive and is released into the environment by animals?

• oxygen
• sugar
• salt
• carbon dioxide

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If the removal of many plants and trees increase in a forest, what effect could this have on the carbon dioxide and oxygen cycle?

• CO2 levels decrease
• CO2 levels increase
• Nitrogen levels decrease
• Oxygen levels increase

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The CO2/O cycle is important to animals because it provides

• a gas they take in when breathing
• chemicals that build bones
• energy they need to move
• fresh water for their survival

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________________ could increase the amount of oxygen in the air.

• Building more houses

• Burning more oil

• Paving more streets

• Planting more trees

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Which of the following removes carbon from the atmosphere?

• Combustion
• Respiration
• Photosynthesis
• Death

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