I believe the answer is A. :)<span />
Answer:
Explanation:
The respiratory system works with the circulatory system to provide this oxygen and to remove the waste products of metabolism. It also helps to regulate pH of the blood. Respiration is the sequence of events that results in the exchange of oxygen and carbon dioxide between the atmosphere and the body cells.
I don't know what the answer to your first question is. All of my teachers have only called it the equilibrium point. However for your second question, a hydrogen bond is a special type of dipole-dipole attraction. Only oxygen, nitrogen, and fluorine are able to make them when bonded with hydrogen. Hydrogen bonding is what makes water have such a high boiling point considering how light the molecule is.<span />
