Understanding the Carbon Cycle

What percentage of all matter in living things is made up of carbon compounds?

• 10%

• 18%

• 25%

• 30%

Which of the following is the hardest naturally occurring substance?

• Diamond

• Iron

• Coal

• Graphite

What process do plants use to convert carbon dioxide into compounds they can use for nutrition?

• Decomposition

• Combustion

• Photosynthesis

• Respiration

Tags

NGSS.MS-LS1-6

How is carbon transferred back to the atmosphere from animals and humans?

• Decomposition

• Combustion

• Photosynthesis

• Respiration

What should we do to help reduce global warming?

• Use more coal

• Increase deforestation

• Plant more trees

• Burn more fossil fuels

Tags

NGSS.MS-ESS3-4

NGSS.MS-ESS3-5

All living things are carbon based.

• True

• False

Answer explanation

All living things are carbon based, making the statement true.

What is happening in step
1?

• Animals are decomposing and realizing carbon into the soil.
• Animals are releasing energy into the environment and storing carbon.
• Animals are turning carbon dioxide from the atmosphere into organic molecules.
• Animals are breaking down organic molecules and releasing carbon dioxide into the atmosphere.

Tags

NGSS.MS-LS2-3