Which of the following is not one of the elements most abundant in living things?

A polluntant released into the atmosphere is

Releasing nitrogen from the soil back into the atmosphere is called

Converting nitrogen in the atmosphere into a form that can be used by plants is called

Which of the following hosts nitrogen-fixing bacteria in nodules on its roots?

The process by which an organism's body releases energy from carbon-based molecules is called

Which process describes how plants make sugar from sunlight, water, and carbon dioxide?

Air pollution can be caused by burning too many

When precipitation gathers into a body of water, it is called

The precipitation that flows over the surface of soil is

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