Answer the following question given this paragraph: All combustion reactions are exothermic reactions. During a combustion reaction, a substance burns as it combines with oxygen. When substances burn, they usually give off energy as heat and light. Look at the big bonfire in the Figure below . The combustion of wood is an exothermic reaction that releases a lot of energy as heat and light. You can see the light energy the fire is giving off. If you were standing near the fire, you would also feel its heat. Q: All combustion reactions are what type of reactions? Choices: - flammable - geothermal - reversible - exothermic A:
exothermic
Answer the following question given this paragraph: Today, remote-control vehicles, called remotely operated vehicles (ROVs) go to the deepest ocean floor. They don't have any people on board. However, they carry devices that record many measurements. They also collect sediments and take photos. Q: What type of vehicles is able to go to the deepest ocean floor? Choices: - off road vehicles - all-terrain vehicles - autonomous controlled airplanes - remote-control vehicles A:
remote-control vehicles
Q: Answer the following question given this paragraph: Fish also have a centralized nervous system with a brain. Fish brains are small compared with the brains of other vertebrates, but they are large and complex compared with the brains of invertebrates. Fish also have highly developed sense organs that allow them to see, hear, feel, smell, and taste. Sharks and some other fish can even sense the very low levels of electricity emitted by other animals. This helps them locate prey. Q: Why do sharks sense low levels of electricity? Choices: - to locate mates - to sleep - to reproduce - to locate prey A:
A: to locate prey
Question: Answer the following question given this paragraph: Water infiltrates the ground because soil and rock are porous. Between the grains are pores, or tiny holes. Since water can move through this rock it is permeable. Eventually, the water reaches a layer of rock that is not porous and so is impermeable. Water stops moving downward when it reaches this layer of rock. Q: Why does water infiltrate the ground? Choices: - gravity - prolonged drought conditions - run-off from flooding - because soil and rocks are porous A:
Answer: because soil and rocks are porous
*Question*
Answer the following question given this paragraph: Figure 41.2 Cells placed in a hypertonic environment tend to shrink due to loss of water. In a hypotonic environment, cells tend to swell due to intake of water. The blood maintains an isotonic environment so that cells neither shrink nor swell. (credit: Mariana Ruiz Villareal). Q: An environment in which cells neither sink nor swell is known as what? Choices: - pressured environment - electrolyte environment - exothermic environment - isotonic environment A:
**Answer**
isotonic environment
Answer the following question given this paragraph: The types of living plants today reflect the evolutionary past of the plant kingdom. From tiny nonvascular mosses to large flowering and fruiting trees, there are modern plants that represent each of the major evolutionary changes that occurred in this important eukaryotic kingdom. Q: Modern plants reflect what kind of changes that have occurred over many, many years? Choices: - unknown changes - tissue changes - tendency changes - evolutionary changes A:
evolutionary changes