The first diagram shows the basic checkmate position with a rook, which can occur on any edge of the board. The black king can be on any square on the edge of the board, the white king is in opposition to it, and the rook can check from any square on the rank or file (assuming that it can not be captured).
Why are vitamins necessary in diet? vitamins are essential in diet because they prevent diseases such as rickets,osteomalacia ,scurvy. vitamin d promotes absorption of calcium and phosphorus compounds from intesâ¦tines and enables the body to use these in formation of teeth and bones.
An important aspect of nutrition is the daily intake of nutrients. Nutrients consist of various chemical substances in the food that makes up each person's diet. Many nutrients are essential for life, and an adequate amount of nutrients in the diet is necessary for providing energy, building and maintaining.eople depend on nutrients in their diet because the human body is not able to produce many of these nutrientsâor it cannot produce them in adequate amounts. Nutrients are essential to the human diet if they meet two characteristics.