Students in ms. nye's science class were using the microscopes to make slides of various organisms: algae, moss, onion cells, human cheek cells, as well as the organism seen here. they were examining cell structures to group the organisms by similarities. several students grouped this organism with the plants they were examining because of the presence of cell walls. another group argued: "this is a fungus not a plant, because the cells do not contain " these are the answer choices a) vacuoles b) a nucleus c) chloroplasts d) well defined organelles