The carbon dioxide-oxygen cycle is best defined as-

• the process in which plants use energy from the sun to make their own food
• a green substance in plant leaves that captures energy from the sun
• living things
• the movement of carbon dioxide and oxygen between organisms and the air

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.

• Water
• Atmosphere
• Sun
• Air

Tags

NGSS.MS-ESS2-1

Which one of these does not add CO2 to the atmosphere?

• cooking with gas
• planting trees
• burning wood
• riding in a bus

Tags

NGSS.MS-LS1-6

Combustion is another word for _______________.

• a train
• a bus
• a dog
• burning

Tags

CCSS.RI.7.4

CCSS.RI.8.4

CCSS.RI.9-10.4

CCSS.RL.7.4

CCSS.RL.8.4

What does not produce carbon dioxide?

• Photosynthesis
• Burning Fossil Fuels
• Animal respiration
• Plants decaying

Tags

NGSS.MS-LS1-6

How do living organisms return carbon to the atmosphere in the carbon cycle?

• respiration and photosynthesis
•  decomposition and respiration

Tags

NGSS.HS-LS2-5

In the carbon cycle, producers take in the gas __

• carbon dioxide
• oxygen
• nitrogen
• carbon monoxide

Tags

NGSS.MS-LS1-6

In what process is Carbon transformed into chemical energy?

• Photosynthesis
• Respiration
• Primary Production
• Secondary Production

Tags

NGSS.MS-LS1-6

What does an "exchange of gases" mean?

• It means that gases are apart of everything. 
• It means that orange juice is an upside down milkshake with a missing tail.
• It means that humans and plants trade gases back and forth.
• It means that carbon in apart of all living things. 

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