Carbon Cycle Steps

What do 'plants' do with the carbon they receive?

• They turn it into water

• They don't need carbon

• They turn it into food by photosynthesis

• They keep it forever

How does carbon get from animals and back into the atmosphere? (CHOOSE ALL THAT APPLY)

• Respiration (breathing)

• After they die, they are broken down by decomposers

• Photosynthesis

• None of these

How do animals get carbon?

• Photosynthesis

• They absorb it from the atmosphere

• The sun

• They eat other plants and animals

How is carbon recycled?

• The carbon cycle

• At the recycle plant

• It can't be recycled

• Through water

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

• Water
• Atmosphere
• Sun
• Air

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

• respiration and photosynthesis
•  decomposition and respiration

Which of the following add carbon dioxide to the atmosphere?

• volcanoes
• combustion of fossil fuels
• animal and plant respiration
• all of these

Earth has a fixed amount of _____.

• trees
• carbon
• carbon dioxide

Carbon needs to be recycled because earth has a _______ amount of carbon.

• Fixed

• Fluctuating

• Constantly Growing

• Constantly Depleting