Answer: Staphylococcus aureus is a gram positive bacteria which is round shaped bacterium that is usually found in the body. They are located in the respiratory track of the body.
Saccharomyces cerevisiae is a yeast species which is used in the brewing, wine making and baking long time ago.
When both of the species were observed under microscope then Saccharomyces cerevisiae will be larger than Staphylococcus aureus.