Question

why should you never eat or drink in the science lab? because it’s messy because food and drinks can become contaminated with ch because there aren’t enough chairs because the teacher said so

Explanation:

In a science lab, there are various chemicals and substances. Food and drinks can get contaminated by these chemicals, which can be harmful if ingested. Messiness is a secondary concern, lack - of - chairs is irrelevant, and "teacher said so" is not the fundamental reason.

Answer:

Because food and drinks can become contaminated with chemicals