Examlex
What is the precise definition of a primary key?
Nitrogen
A chemical element with symbol N and atomic number 7, essential for life, it makes up a major part of the earth's atmosphere and is a key component of all proteins.
Phosphorus
A chemical element (P) that is essential for the formation of DNA, RNA, and ATP, playing a critical role in energy storage and transfer within cells.
Nitrification
A microbial process by which ammonia is converted into nitrate, an important step in the nitrogen cycle.
Ammonium
A positively charged ion (NH4+) formed by the addition of a hydrogen ion to ammonia (NH3).
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