It is necessary to heat fix bacteria to the microscope slide. what happens when you pass the microscope slide through a flame a few times?

When you pass the microscope slide through a flame a few time, the bacteria smear becomes adhere to the slide.
Heat fixing of a bacteria involves passing the microscope slide on which a dried bacteria smear is spread through a busen flame three or four times in order to make the smear to adhere to the slide. The heat fixing preserve the morphology of the organism been fixed.

D.) domain, kingdom, phylum, class, order, family, genus then species