98. all of the following are true of water except a) neighboring molecules are held together by hydrogen bonds. b) it is less dense as a solid than as a liquid. c) it is a polarized molecule, where the oxygen is slightly positive and the hydrogens are slightly negative. d) it is the basis for all life as we know it. e) it can dissolve molecules with electrical charges.

C) it is a polarized molecule, where the oxygen is slightly positive and the hydrogens are slightly negative.

Explanation:

The water molecule is polarized, but the oxygen atom is slightly negative and the hydrogens are slightly positive.

Electronegativity is a property that measures how much an atom will tend to attract electrons towards itself. Because electrons are negatively charged, the more electronegative an atom is, the more negative its partial charge will be.

Oxygen is much more electronegative than hydrogen, and thus it will attract the electrons in the molecule, keeping them away from the hydrogens.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.