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A virtual group is one that
Ecosystem Experiments
Controlled studies designed to investigate the relationships among organisms and their environment within an ecosystem.
Heterocysts
Specialized nitrogen-fixing cells found in some filamentous cyanobacteria, providing an anaerobic environment necessary for the fixation of atmospheric nitrogen.
Nitrogen Cycle
A biochemical cycle that involves the conversion of nitrogen into multiple chemical forms as it circulates among the atmosphere, terrestrial, and marine ecosystems.
Nitrification
A microbial process in the nitrogen cycle where ammonia is converted into nitrite and then into nitrate.
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