Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Q: Context: No doubt you already have a good idea of what temperature is. You might define it as how hot or cold something feels. In physics, temperature is defined as the average kinetic energy of the particles in an object. When particles move more quickly, temperature is higher and an object feels warmer. When particles move more slowly, temperature is lower and an object feels cooler. If two objects have the same mass, the object with the higher temperature has greater thermal energy. Temperature affects thermal energy, but temperature isnt the same thing as thermal energy. Thats because an objects mass also affects its thermal energy. The examples in Figure 18.1 make this clear. In the figure, the particles of cocoa are moving faster than the particles of bathwater. Therefore, the cocoa has a higher temperature. However, the bath water has more thermal energy because there is so much more of it. It has many more moving particles. Bill Nye the Science Guy cleverly discusses these concepts at this URL: MEDIA Click image to the left or use the URL below. URL: If youre still not clear about the relationship between temperature and thermal energy, watch the animation "Tem- perature" at this URL: . Temperature is measured with a thermometer. A thermometer shows how hot or cold something is relative to two reference temperatures, usually the freezing and boiling points of water. Scientists often use the Celsius scale for temperature. On this scale, the freezing point of water is 0C and the boiling point is 100C. To learn more about measuring temperature, watch the animation Measuring Temperature at this URL: Did you ever wonder how a thermometer works? Look at the thermometer in Figure 18.2. Particles of the red liquid have greater energy when they are warmer, so they move more and spread apart. This causes the liquid to expand and rise higher in the glass tube. Like the liquid in a thermometer, most types of matter expand to some degree when they get warmer. Gases usually expand the most when heated, followed by liquids. Solids generally expand the least. (Water is an exception; it takes up more space as a solid than as a liquid.) Something that has a high temperature is said to be hot. Does temperature measure heat? Is heat just another word for thermal energy? The answer to both questions is no. Heat is the transfer of thermal energy between objects that have different temperatures. Thermal energy always moves from an object with a higher temperature to an object with a lower temperature. When thermal energy is transferred in this way, the warm object becomes cooler and the cool object becomes warmer. Sooner or later, both objects will have the same temperature. Only then does the transfer of thermal energy end. For a visual explanation of these concepts, watch the animation "Temperature vs. Heat" at this URL: . Figure 18.3 illustrates an example of thermal energy transfer. Before the spoon was put into the steaming hot coffee, it was cool to the touch. Once in the coffee, the spoon heated up quickly. The fast-moving particles of the coffee transferred some of their energy to the slower-moving particles of the spoon. The spoon particles started moving faster and became warmer, causing the temperature of the spoon to rise. Because the coffee particles lost some of their kinetic energy to the spoon particles, the coffee particles started to move more slowly. This caused the temperature of the coffee to fall. Before long, the coffee and spoon had the same temperature. The girls in Figure 18.4 are having fun at the beach. Its a warm, sunny day, and the sand feels hot under their bare hands and feet. The water, in contrast, feels much cooler. Why does the sand get so hot while the water does not? The answer has to do with specific heat. Specific heat is the amount of energy (in joules) needed to raise the temperature of 1 gram of a substance by 1C. Specific heat is a property that is specific to a given type of matter. Table 18.1 lists the specific heat of four different substances. Metals such 
 Question: transfer of thermal energy between objects with different temperatures

A: heat
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Q: Context: Cells were first discovered in the mid-1600s. The cell theory came about some 200 years later. You can see a re- enactment of some of the discoveries that led to the cell theory in this video: MEDIA Click image to the left or use the URL below. URL: British scientist Robert Hooke first discovered cells in 1665. He was one of the earliest scientists to study living things under a microscope. He saw that cork was divided into many tiny compartments, like little rooms. (Do the cells in Figure 3.1 look like little rooms to you too?) Hooke called these little rooms cells. Cork comes from trees, so what Hooke observed was dead plant cells. In the late 1600s, Dutch scientist Anton van Leeuwenhoek made more powerful microscopes. He used them to observe cells of other organisms. For example, he saw human blood cells and bacterial cells. Over the next century, microscopes were improved and more cells were observed. By the early 1800s, scientists had seen cells in many different types of organisms. Every organism that was examined was found to consist of cells. From all these observations, German scientists Theodor Schwann and Matthias Schleiden drew two major conclusions about cells. They concluded that: cells are alive. all living things are made of cells. Around 1850, a German doctor named Rudolf Virchow was observing living cells under a microscope. As he was watching, one of the cells happened to divide. Figure 3.2 shows a cell dividing, like the cell observed by Virchow. This was an aha moment for Virchow. He realized that living cells produce new cells by dividing. This was evidence that cells arise from other cells. The work of Schwann, Schleiden, and Virchow led to the cell theory. This is one of the most important theories in life science. The cell theory can be summed up as follows: All organisms consist of one or more cells. Cells are alive and the site of all life processes. All cells come from pre-existing cells. All cells have certain parts in common. These parts include the cell membrane, cytoplasm, DNA, and ribosomes. The cell membrane is a thin coat of phospholipids that surrounds the cell. Its like the skin of the cell. It forms a physical boundary between the contents of the cell and the environment outside the cell. It also controls what enters and leaves the cell. The cell membrane is sometimes called the plasma membrane. Cytoplasm is the material inside the cell membrane. It includes a watery substance called cytosol. Besides water, cytosol contains enzymes and other substances. Cytoplasm also includes other cell structures suspended in the cytosol. DNA is a nucleic acid found in cells. It contains genetic instructions that cells need to make proteins. Ribosomes are structures in the cytoplasm where proteins are made. They consist of RNA and proteins. These four components are found in all cells. They are found in the cells of organisms as different as bacteria and people. How did all known organisms come to have such similar cells? The answer is evolution. The similarities show that all life on Earth evolved from a common ancestor. Besides the four parts listed above, many cells also have a nucleus. The nucleus of a cell is a structure enclosed by a membrane that contains most of the cells DNA. Cells are classified in two major groups based on whether or not they have a nucleus. The two groups are prokaryotic cells and eukaryotic cells. Prokaryotic cells are cells that lack a nucleus. The DNA in prokaryotic cells is in the cytoplasm, rather than enclosed within a nuclear membrane. All the organisms in the Bacteria and Archaea Domains have prokaryotic cells. No other organisms have this type of cell. Organisms with prokaryotic cells are called prokaryotes. They are all single-celled organisms. They were the first type of organisms to evolve. They are still the most numerous organisms today. You can see a model of a prokaryotic cell in Figure 3.3. The cell in the figure is a bacterium. Notice how it contains a cell membrane, cytoplasm, ribosomes, and several other structures. However, the cell lacks a nucleus. The cells DNA is circular. 
 Question: The smallest unit of living things that can carry out the chemical reactions of life is the

A: cell
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Q: Context: Private investigator Patrick Kenzie (Casey Affleck) and his partner/girlfriend Angie Gennaro (Michelle Monaghan) witness a televised plea by a woman named Helene McCready (Amy Ryan) for the return of her missing daughter Amanda, who was abducted with her favorite doll "Mirabelle". Patrick and Angie are then hired by the child's aunt Beatrice (Amy Madigan) to find Amanda and discover that Helene and her boyfriend "Skinny Ray" (Sean Malone) had recently stolen money from Cheese (Edi Gathegi), a local Haitian drug lord. After Ray is murdered, Patrick and Angie join the police detectives Remy Bressant (Ed Harris) and Nick Poole (John Ashton) with investigating the case and assist in arranging the trade of money for the return of Amanda. Captain Jack Doyle (Morgan Freeman) reads Patrick a telephone transcript of the drug lord setting up an exchange for Amanda. The exchange at a nearby quarry in Quincy is botched and it is believed Amanda drowned; her doll is found in the quarry and returned to Helene. Doyle, whose own daughter was killed years before, takes responsibility for the death and goes into early retirement. Two months later, a seven year old boy is abducted in Everett and Patrick receives information that the boy was taken by a known child molester. After entering the suspect's house and finding evidence of the abducted boy, Patrick returns with Remy and Nick to rescue him. They are seen by the residents and Nick is shot. Patrick enters the house during the shootout and finds one of the residents dead. He retreats into the child molester's room, where he finds the boy's dead body; he then shoots the child molester in the back of the head in a fit of rage. Nick later dies of his wounds. Trying to alleviate Patrick's guilt over the events at the house, Remy unthinkingly confides that he once planted evidence on someone with the help of "Skinny Ray" whom he had initially told Patrick he didn't know. After Nick's funeral, Patrick speaks to a police officer, who tells him that Remy had been asking about the drug lord's stolen money before the drug lord knew it was missing. Patrick then questions Beatrice's husband Lionel (Titus Welliver) in a bar and pieces together that Lionel and Remy had conspired to stage a fake kidnapping in order to take the drug money for themselves and to take Amanda from her neglectful mother's care. At that point, Remy (trying to cover for his earlier mistake) enters the bar, while wearing a latex mask and holding a shotgun, and stages a robbery. He points the shotgun at Lionel's head, but the bartender shoots Remy twice in the back. Remy flees and is pursued by Patrick to the rooftop of a nearby building, where he dies. Patrick is questioned by the police about Remy's death and learns that the police never had a phone transcript like the one that Doyle had read to him prior to the botched exchange. Patrick and Angie drive to Doyle's home, where Patrick finds Amanda living with Doyle and his wife; Doyle was part of the phony kidnapping all along. Patrick threatens to call the authorities, but Doyle attempts to convince him that Amanda is better off living with them than with her mother, and that is reason enough not to get involved. Patrick leaves and discusses the choices with Angie, who says she will leave him if he calls the police, since she also believes Amanda is much better off with the Doyles. In the next scene, the police arrive, Doyle is arrested, Amanda is returned to her mother amidst heavy publicity, and Patrick and Angie break up. Patrick later visits Amanda as Helene is about to leave on a date with someone she met during the publicity over her daughter's disappearance. Helene informs Patrick that Beatrice has been forbidden to visit and is upset about her husband's arrest. Helene has no babysitter for Amanda and when asked, she tells Patrick that Helene's friend, Dottie (Jill Quigg) will watch her, even though she has yet to ask Dottie herself. Patrick volunteers to watch Amanda, who is holding her 
 Question: What is Doyle's profession?

A:
captain
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