Final answer:
When a lab experiment is not completed, discussing the issue with your instructor is the correct and safe course of action to take.
Step-by-step explanation:
If a lab experiment is not completed, the appropriate action is to discuss the issue with your instructor. Safety and integrity are crucial in the lab, and making up results or working unsupervised can lead to accidents or flawed science. Communicating with your instructor allows for an open dialogue about how to proceed, which may include scheduling a time to safely complete the experiment or receiving alternative instructions for making up the missed work. Sneaking in after school, working alone, eating in the lab, and fabricating results all violate laboratory safety and ethical guidelines, which are critical to a successful science education and practice.