Sertoli cell, Sertoli's cell-elongated cells found in the seminiferous tubules of the testis; apparently they nourish the spermatids. biological science, biology-the science that studies living organisms. plant cell-a cell that is a structural and functional unit of a plant.
The life expectancy of a toilet is more than 100 years. In fact, a study conducted by the National Association of Home Builders determined that toilets can last indefinitely.
The average age at which children complete toilet training in the United States is approximately three years old. In some cases children learn bladder control first; others learn bowel control before bladder control. Control is generally first achieved during the daytime, well before a child is able to stay dry at night.