Only humans can remove carbon from this carbon sink/reservoir.

Animals and plants return CO2 to the atmosphere by “breathing” in a process called

One of the main ways CO2 is removed from the atmosphere is

Organisms at the _____ of an energy pyramid have the _______ amount of energy available to them compared to organisms at other levels.

Processes that release CO2 to the atmosphere are known as carbon ________

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

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

Which process does not produce carbon dioxide?

How does the carbon in grass become part of a lion?

Which of the following removes carbon from the atmosphere?

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

Which of the following is a true statement?

Which of the following is an example of a decomposer?

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

Carbon is a reactant in respiration in the form of?

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