As the members of a given generation age, their instinct of social conservation becomes stronger, which inevitably and necessarily brings them into conflict with the normal attribute of youthâinnovation. Other important theorists of the 19th century were John Stuart Mill and Wilhelm Dilthey.
Plants require more than just water and sunlight to grow. They also require many nutrients found in the soil. One of the most important nutrients required for plant growth is nitrogen. Nitrogen is used to build plant proteins and nucleic acids, including DNA.
Plants need nitrogen to grow. They get the nitrogen out of the soil that they grow in. The nitrogen is sucked in through the roots and pumped all the way up to the leaves. That's a long way if that tree is fifty feet tall.