Food pyramid (nutrition) A food pyramid or diet pyramid is a pyramid-shaped diagram representing the optimal number of servings to be eaten each day from each of the basic food groups. The first food pyramid was published in Sweden in 1974.
Before partitioning can occur, the chromosomes must become aligned so that the separation process can occur in an orderly fashion. The alignment of replicated chromosomes and their separation into two groups is a process that can be observed in virtually all eukaryotic cells. Interfase must happen before mitosis can begin. Interfase is when the parent cell stores energy and becomes bigger so it can make the two daughter cells. Source(s):
Cells undergo mitosis to replace dead cells. If there is/are cell(s) absent in any part of the body, mitosis occurs to replace the missing cell(s). So basically, if an organism is able to keep all its cells from being harmed in any way, mitosis will never be required as no cell will need replacement. Meiosis: Cells undergo meiosis to form gametes (sex cells).