Well , the student has not done justice to the question technically. He/she classified examples of cells entirely on other basis other than the observations seen on the prepared microscopic slides
Prepared microscopic slides are set of slides that have been previously mounted by an individual who is a professional in the field.
It process involve immersing the sample ( either before or after fixation or mounting) in a dye solution and then rinsing and observing the sample under a microscope.
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