About 90 chemical elements have been discovered in wildlife, i.e., most of all known to date. There are no special elements characteristic only of living organisms, and this is one of the proofs of the commonality of animate and inanimate nature. But the quantitative content of certain elements in living organisms and in their inanimate environment is significantly different. For example, silicon in the soil is about 33%, and in terrestrial plants only 0.15%. Such differences indicate the ability of living organisms to accumulate only those elements that they need for life.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.