What removes oxygen from the air?

Ten percent of energy is transferred from one level to the next level on the energy pyramid. What happens to the other 90% of energy?

Plants are

An organism that uses energy to produce its own food supply from inorganic compounds is called a(an)

Nitrogen fixation is carried out primarily by

During nitrogen fixation, nitrogen gas is converted to a form that _____ can use

The breakdown of dead materials into carbon dioxide and water is called

Water leaving the plants is called?

Water that gets heated leaves from the ocean through the process of _______________

Biotic and abiotic factors together make up a(n)

When organisms interact and both benefit from the interaction, what term is used to describe this interaction?

The burning of fossil fuels has the greatest and most direct impact on the

Carbon is removed from the atmosphere through what process?

This process is responsible for excess nitrogen and phosphorus entering streams and oceans.

Use of agricultural fertilizers adds excess _____ to ecosystems and can cause eutrophication of waters.

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