What dose it mean to describe water molecules as being polar?

Water is a "polar" molecule, meaning that there us an uneven distribution of electron density. Water has a partial negative charge (-) near the oxygen atom due the unshared pairs of electron, and partial positive charges (+) near the hydrogen atoms.
 
Is that better?

Air goes past the epiglottis and into the trachea when you breathe in. from there, it goes to your vocal cords in the larynx until it reaches the bronchi. from the bronchi, air passes into each lung.