Examlex
Give the name of the organization that represents the United States in the ISO 9000.
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.
Atmosphere
The layer of gases surrounding a planet, essential for life on Earth, providing air to breathe and protecting from harmful solar radiation.
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