*Question*
Answer the following question given this paragraph: Consider petroleum as an example. Oil companies explore for petroleum in areas where they think it might be. When they find it, they must determine how much is there. They must also know how hard it will be to get. If there's enough to make it worthwhile, they will decide to go for it. To extract petroleum, companies they must build huge rigs, like the one in Figure below . An oil rig drills deep into the ground and pumps the oil to the surface. The oil is then transported to a refinery. At the refinery, the oil is heated. It will then separate into different products, such as gasoline and motor oil. Finally, the oil products are transported to gas stations, stores, and industries. At every step, energy is used. For every five barrels of oil we use, it takes at least one barrel to get the oil. Q: What is used during every step of oil production, from exploration to distribution? Choices: - coal - robots - water - energy A:
**Answer**
energy

*Question*
Answer the following question given this paragraph: Moving into an area, or immigration, is a key factor in the growth of populations. Shown above is actual vintage luggage left by some of the millions of immigrants who came through Ellis Island and into the United States. Q: What is a key factor in the growth of populations? Choices: - legislation - gentrification - assimilation - immigration A:
**Answer**
immigration

*Question*
Answer the following question given this paragraph: Figure 17.6 In influenza virus infection, glycoproteins attach to a host epithelial cell. As a result, the virus is engulfed. RNA and proteins are made and assembled into new virions. Q: Influenza is a type of what, where glycoproteins attach to a host epithelial cell? Choices: - recent disease - nucleus disease - atoms disease - viral disease A:
**Answer**
viral disease

*Question*
Answer the following question given this paragraph: Sound is a form of energy that travels in waves. Sound waves cannot travel through empty space, but they can travel through gases. Gases in the air allow us to hear most of the sounds in our world. Because of air, you can hear birds singing, horns tooting, and friends laughing. Without the atmosphere, the world would be a silent, eerie place. Q: What helps sound travel in waves? Choices: - molecules - speaker placements - temperatures - gases A:
**Answer**
gases