The term 'Basis of Life' can be summarized by the crossword solution of 'Carbon' (6 letters). Carbon is an essential element for life on Earth, as it is found in all living organisms. It is the basis for organic molecules, which are necessary for the formation of proteins, carbohydrates, and lipids. Carbon is also a key component of the carbon cycle, which is responsible for the cycling of carbon between the atmosphere, land, and oceans.