Final answer:
To recognize complex tissue, students should look for slides with different cell types, which indicates the presence of complex tissues like dermal tissue, xylem, phloem, and ground tissue, as opposed to simple tissues which appear uniform.
Step-by-step explanation:
Students are asked to sort tissue slides into simple and complex tissues. To recognize a complex tissue under the microscope, they should look for the presence of different cell types. Complex tissues, such as dermal tissue, xylem, phloem, and ground tissue, are composed of cells that vary significantly in appearance but work collaboratively to perform the same function. On the other hand, simple tissues are made up of cells that are morphologically similar, often appearing uniform as they are made of the same cell type. For instance, parenchyma tissue, which is simple, will show a uniform appearance, while xylem and phloem will display a variety of cell types and structures.