Actually evaporation is not the correct term. It is boiling

No. They are shared but oxygen has a higher electronegativity, the pull of electrons to it's own nucleus, so the electrons are more drawn towards the oxygen. This unequal sharing cause the water molecule to be polar.

The cell membrane is a phospholipid bilayer. It has two layers of phospholipids, each phospholipid has a hydrophobic (water fearing) and a hydrophylic (water loving) head. The tails come together to stay out of the water making the membrane. Also, there are several proteins embedded in the membrane (some have carbohydrate tails attached) and cholesterol … Read more