You look through a microscope and see that a cell has a cell wall. explain what else you need to know in order to determine what type of cell it is?

The first thing you need to know is wheather the cell is prokaryotic or eukaryotic. If it does not have nucleus it might be any prokaryotic cell except mycoplasma bacteria. If it is with nucleus, then it might be algae, plants and fungi. The difference between algae, plants and fungi cell wall is in their structure. Plant cell walls containlignin, suberin or cutin, algae possess cell walls made of glycoproteins and polysaccharides  and fungi possess cell walls made of the N-acetylglucosamine polymer chitin.