Question

what is the most important role of hydrogen bonding between water molecules?
o it allows oxygen and hydrogen atoms to be charged.
o it enables water molecules to bond to each other.
o it allows cells to keep water in balance.

Explanation:

Hydrogen - bonding between water molecules is a type of intermolecular force. It specifically enables water molecules to bond to each other, which gives water unique properties like high surface - tension, high heat capacity, etc. Oxygen and hydrogen atoms in water are already charged due to electronegativity differences and not because of hydrogen - bonding. And while water balance in cells is important, it is a secondary consequence of water's properties due to hydrogen - bonding rather than the most direct role of hydrogen - bonding between water molecules.

Answer:

It enables water molecules to bond to each other.