Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.
Spermatogonia are the immature cells that come from stem cells and they are present in testis, developed in the wall of a structure called seminiferous tubules.
Spermatogonia divide to maitain thier numbers.
Spermatogonia are the diploid cells.
Spermatogonia undergo mitosis and give rise to a cell called spermatocytes that are diploid cells.