Carbon Cycle

oxygen is a gas produced by _ and used by  _ 

• plants and animals 
• photosynthesis and carbon dioxide 
• animals and plants 
• carbon dioxide and photosynthesis

if there is a fire in a forest, there will be less _ in the environment?

• nitrogen
• oxygen

All of the carbon in existence is continually recycled in the carbon cycle

• True
• False

Which of the following removes carbon from the atmosphere?

• Combustion
• Respiration
• Photosynthesis
• Death

Organisms that do not decompose can be buried and become what?

• water
• nutrients
• air
• fossil fuels

Which process converts carbon in the form of sugar into carbon dioxide gas?

• Bioremediation
• Photosynthesis
• Respiration
• Transpiration

If the plant population decreased, the amount of carbon in the atmosphere would _________.

• Stay the same

• Increase

• Decrease

carbon dioxide is a gas produced  by ________ and used by __________

• plants and animals 
• carbon and photosynthesis
• animals and plants 
• photosynthesis

Plants use ____________ to make their own food

• Water

• Sunlight

• Carbon dioxide

• All of these

Which is an example of a carbon sink?

• 
• 
• 
•