Final answer:
In a science lab, proper labeling and containment is important when presenting foods not intended for consumption. The guard should avoid eating or drinking in the lab, clean materials thoroughly, be cautious when working with heat, and promptly inform the teacher about any incidents.
Step-by-step explanation:
In a science lab, if foods not intended for consumption are presented, it is important to have proper labeling and containment to ensure that they are not mistakenly consumed. The four steps the guard should take are:
- Avoid eating or drinking anything in the lab
- Thoroughly clean materials to prevent any leftover substances from interacting with future experiments
- Exercise caution when working with flames or heat plates
- Inform the teacher immediately about any accidents, injuries, or damaged/discarded materials