Question

which characteristic of water contributes to its special, life - sustaining properties? unequal sharing of electrons that creates polarity low boiling point that contributes to high heat capacity presence of oxygen that causes oxygen bonds between molecules ionic bonds that create polarity

Explanation:

Water has special life - sustaining properties due to hydrogen bonds between its molecules. Unequal sharing of electrons in water molecules creates polarity which is related to hydrogen bonding. High heat capacity of water is also important for life - it helps regulate temperature. The presence of oxygen in water molecules is crucial for respiration in aquatic organisms. Water does not have ionic bonds in the context of its life - sustaining properties. Low boiling point would not contribute to its life - sustaining properties as water has a relatively high boiling point. So the key factor among the options is the presence of hydrogen bonds related to the oxygen in water molecules.

Answer:

Presence of oxygen that causes bonds between molecules