Both statements are right.
We also have hydrogen bonding to thank for ice floating on water. Very few solids are less dense than their liquids, but that's the way it is with water ice. If ice didn't float on water, it would sink to the bottom of the oceans, which would be bad news for life on Earth. (Ice does sink in alcohol.)
Hydrogen bonding is also important in DNA and proteins, so there are many reasons that life wouldn't exist without hydrogen bonding.
|