Which below does NOT describe nitrogen?

Nitrogen which is not combined with any other element is

What must happen to free nitrogen before organisms can use it?

What is the nitrogen cycle?

Which way can nitrogen be fixed?

Where are nitrogen fixing bacteria NOT located?

Which below is not an example of a legume.

How do animals get the nitrogen they need?

What happens to the nitrogen in animal waste or decomposing organisms.

Which below is NOT a step in fixing free nitrogen into usable nitrogen.

Which below is NOT true about carbon.

The process by which plants take carbon dioxide, water and energy from the sun to produce sugars and oxygen.

The process by which an organism takes sugar, combines it with oxygen to produce carbon dioxide, water vapor and energy.

Anything which releases carbon dioxide into the atmosphere is considered a

Which below is a carbon source?

Anything which stores more carbon than it releases is called a

Why are plants important in the carbon cycle?

How are humans influencing the amount of carbon in the carbon cycle?

What is the largest carbon sink on Earth?

How does the ocean influence the amount of carbon dioxide in the atmosphere.

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