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.
The foods we eat contain a variety of vitamins, minerals, and other important nutrients that help keep our bodies healthy. Two nutrients in particular, calcium and vitamin D, are needed for strong bones.1  The Role of Calcium. 2  Calcium Culprits. 3  Calcium Supplements. 4  Vitamin D. 5  A Complete Osteoporosis Program.he foods we eat contain a variety of vitamins, minerals, and other important nutrients that help keep our bodies healthy. Two nutrients in particular, calcium and vitamin D, are needed for strong bones. 1  The Role of Calcium. 2  Calcium Culprits. 3  Calcium Supplements. 4  Vitamin D. 5  A Complete Osteoporosis Program.