Question

before beginning a lab, students with long hair should

o tie their hair back.

o ask their partner to do the lab.

o ask their teacher what to do.

o comb their hair.

Explanation:

In a lab, long - hair can be a safety hazard. Tying hair back keeps it out of the way of chemicals, flames, and equipment. Asking a partner to do the lab is not a proper solution. Asking the teacher is unnecessary as tying hair back is a well - known safety measure. Combing hair doesn't address the safety risk.

Answer:

tie their hair back.