*Question*
Answer the following question given this paragraph: Soil is a precious resource. It allows us to grow food and the materials we use to make everything from the shirt you have on to the medicine you took this morning. Soil is made up of small pieces of rock that have broken down over hundreds, if not thousands, of years. Soil is also partly made up of the remains of plants and animals, and is home to many organisms, from earthworms to ants. But soil can be damaged by unsustainable farming practices and clear-cut logging. In this chapter, you will learn how soil forms, what it contains, and how to protect it. Q: What precious resource allows us to grow food as well as materials we turn into clothing and medicine? Choices: - petroleum - mercury - gasoline - soil A:
**Answer**
soil

*Question*
Answer the following question given this paragraph: Isotopes have different numbers of neutrons in their nuclei. Q: Isotopes have different number of these in their nuclei? Choices: - protons - electrons - atoms - neutrons A:
**Answer**
neutrons

*Question*
Answer the following question given this paragraph: For example, your body has an internal thermostat. During a winter day, in your house a thermostat senses the temperature in a room and responds by turning on or off the heater. Your body acts in much the same way. When body temperature rises, receptors in the skin and the brain sense the temperature change. The temperature change triggers a command from the brain. This command can cause several responses. If you are too hot, the skin makes sweat and blood vessels near the skin surface dilate. This response helps decrease body temperature. Q: Like a house, your body has what kind of mechanism that responds to changes in temperature? Choices: - external thermostat - mechanical thermostat - sensitive thermostat - internal thermostat A:
**Answer**
internal thermostat

*Question*
Answer the following question given this paragraph: A tornado only strikes a small area. But it can destroy everything in its path. Most injuries and deaths from tornadoes are caused by flying debris ( Figure below ). In the United States, an average of 90 people are killed by tornadoes each year. The most violent two percent of tornadoes account for 70% of the deaths by tornadoes. Q: What consequence of a tornado is responsible for most injuries and deaths? Choices: - catching debris - touring debris - falling debris - flying debris A:
**Answer**
flying debris