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 physical maturity and readiness skills needed for successful toilet learning appear at the same time in girls and boys-between 18 and 30 months of age. The average age for girls to be toilet trained is 29 months, and for boys it's 31 months. Keep in mind that these are averages.