The laws of thermodynamics are time-honored principles that describe the behavior of energy. (2) These laws are based on certain observations about the behavior of matter and energy that are remarkably invariable from one instance to the next. (3) Such consistency leads to predictions. (4) What happens, for example, to objects raised above the ground and then released? (5) What happens to an object that is heated and then set aside, away from the heat? (6) Everyone can predict that the first object will fall to the ground and that the second will cool. (7) Such observations, made time and again, have eventually led to the formulation of laws of nature. The First Law (8) The first law of thermodynamics states that energy can neither be created nor destroyed, but it can be converted from one form to another. (9) Understandably, the first law is also called the law of conservation of energy. (10) What the first law means is that the total amount of energy present in a system remains constant. (11) The concept refers to idealized conditions that exist only in what is called an "isolated system"one in which matter and energy cannot enter and leave. (12) Such systems do not really exist (except perhaps as the universe itself) but are contrived as models by scientists who wish to test their ideas under hypothetical conditions that can be limited and controlled. Question8. Which sentence states the most important information in paragraph 2 (sentences 8-12)? a. 8 b. 9 c. 10 d. 11 e. 12