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Essential for almost all living things; needed for chlorophyll, and is a co-factor for many other enzymes; has multiple medical uses. [11] Large doses can have toxic effects. [11] manganese: 25: 5a: Essential for almost all living things, although in very small amounts; it is a cofactor for many classes of enzymes.
A definition states the meaning of a word using other words. This is sometimes challenging. Common dictionaries contain lexical descriptive definitions, but there are various types of definition – all with different purposes and focuses. A definition is a statement of the meaning of a term (a word, phrase, or other set of symbols).
For Aristotle and his scholastic followers, the notion of essence is closely linked to that of definition . [4] Stoic philosopher Seneca (d. 65 AD) attributed creation of the word to Cicero (d. 43 BC), while rhetor Quintilian (d. 100 AD) claimed that the word was created much earlier, by the stoic philosopher Sergius Plautus (sec. I AD).
Boron is essential to plants, [42] [43] [44] but not animals. [6] Non-essential elements can sometimes appear in the body when they are chemically similar to essential elements (e.g. Rb + and Cs + replacing Na +), so that essentiality is not the same thing as uptake by a biological system. [1]
The history of scientific method considers changes in the methodology of scientific inquiry, not the history of science itself. The development of rules for scientific reasoning has not been straightforward; scientific method has been the subject of intense and recurring debate throughout the history of science, and eminent natural philosophers and scientists have argued for the primacy of ...
Essential nutrients cannot be synthesized by the body, and must be obtained from food. Molecules of carbohydrates and fats consist of carbon, hydrogen, and oxygen atoms. Carbohydrates range from simple monosaccharides (glucose, fructose, galactose) to complex polysaccharides (starch, glycogen).
Important debates in the academic literature concern to what extent motivation is innate or based on genetically determined instincts rather than learned through previous experience. A closely related issue is whether motivational processes are mechanistic and run automatically or have a more complex nature involving cognitive processes and ...
These features must have two important qualities to provide a comprehensive definition. [11] Features entailed by the definition of a concept must be both necessary and sufficient for membership in the class of things covered by a particular concept. [11] A feature is considered necessary if every member of the denoted class has that feature.