This is easy, quick, and inexpensive lab, related to cells, plants/botany, and transpiration, helps students identify leaf stomata and connect the structure to its function. I'm not the first to use this lab, but I've created a simple worksheet to help focus students during the activity. Requires easily accessible materials including lettuce, microscopes, etc. Could be used as an introduction or a follow-up exploration. Includes student worksheet, teacher tips, and ideas for lab extensions.