wash hands. tie back long hair. clean all glassware. turn off Bunsen burner.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: When finished with a laboratory investigation the last thing a student should do is to
Possibilities:
- wash hands.
- tie back long hair.
- clean all glassware.
- turn off Bunsen burner.

wash hands.