A swelling on a plant root that contains nitrogen-fixing bacteria is

The brown smog produced when air pollutants react with sunlight is

The cycling of chemical elements through the living and nonliving parts of an ecosystem is

Some ___________ in soil perform denitrification. This releases nitrogen back into the atmosphere.

_____________________ is passed up the food chain by herbivores and carnivores.

Nitrogen is absorbed by plants. Plants use nitrogen to make important plant _______________________.

Nitrogen molecules make up _______________________ of the earth's atmosphere.

________________________ release nitrogen back into the soil. They do this by breaking down the material in dead organisms and their waste products.

Bacteria in soil and in the roots of ____________________________ perform nitrogen fixation.

What are two ways in which cutting down the trees in a forest affect the ecosystem?

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