What are Matter Cycles? | Carbon Cycle | Definition, Steps, Importance, Diagram & Facts | Science

What is the percentage of Nitrogen in our atmosphere?

• 20.95%

• 78.08%

Plants take in _____ and release ______?

• oxygen, nitrogen

• carbon dioxide, oxygen

• oxygen, carbon dioxide

Humans and animals inhale ______ and exhale ______?

• Carbon dioxide, Oxygen 

• Nitrogen, Oxygen

• Oxygen, Carbon dioxide

How does carbon enter our atmosphere?

• as oxygen

• as nitrogen

• as carbon dioxide

What processes allow carbon to enter our atmosphere?

• Respiration

• Combustion

• Decomposition

• All of the above

What are the three (3) sources of carbon dioxide in the atmosphere?

How do plants consume carbon dioxide?

• worms

• respiration

• photosynthesis

• dirt

who consumes carbon dioxide?

• producers

• consumers

• both, producers and consumers

How do producers and consumers become carbon through combustion?

• eating

• breathing in and out

• dying and decomposing and becoming fossil fuel over thousands of years

Which of the below is NOT part of combustion?

• motorcycle or car exhaust

• volcanoes

• forest fires

• thousands of people breathing