Respiration is the chemical process by which organic compounds release energy. The compounds change into different ones by exergonic reactions.
There are two types of respiration:
aerobic, which requires oxygen and releases lots of energyanaerobic, which does not require oxygen but releases much less energy per mole of starting material
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.