Shades of blue show climate divisions that had monthly average temperatures below 50Â°F. The darker the shade of blue, the lower the average temperature. Climate divisions shown in shades of orange and red had average temperatures above 50Â°F. The darker the shade of orange or red, the higher the average temperature.
A stroma is the connective, part of a cell, organ or tissue. The  function of a stroma is to hold the cell, organ, or tissue together  and help it maintain form. Edit.
Because its main function is to nourish the developing sperm cells through the stages of spermatogenesis, the Sertoli cell has also been called the mother or nurse cell.Sertoli cells also act as phagocytes, consuming the residual cytoplasm during spermatogenesis.ecause its main function is to nourish the developing sperm cells through the stages of spermatogenesis, the Sertoli cell has also been called the mother or nurse cell.