7. EVALUATING METHODS Clean rooms used
for sterile biological research are sealed and
operate at slightly above atmospheric pressure.
Explain why.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.

c

explanation: