Please answer this: I read this background article the other day: Recall that air pollution is due to chemical substances and particles released into the air mainly by human actions. When most people think of air pollution, they think of the pollution outdoors. But it is just as easy to have indoor air pollution. Your home or school classroom probably doesn't get much fresh air. Sealing up your home reduces heating and cooling costs. But this also causes air pollution to stay trapped indoors. And people today usually spend a majority of their time indoors. So exposure to indoor air pollution can become a significant health risk. I am facing a new situation today: Patty was a runner and liked hiking so she spent a lot of time outdoors. Her friend Fay sealed up her home and spent most of her time indoors. Both friends lived in an area with moderate to high levels of air pollution and attended a seminar where they learned more about the impact of air pollution on human health. Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which friend was exposed to less indoor pollution?
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Answer: Patty

Please answer this: I read this background article the other day: The lungs of mammals are unique in having alveoli . These are tiny, sac-like structures. Each alveolus is surrounded by a network of very small blood vessels (see Figure below ). Because there are millions of alveoli in each lung, they greatly increase the surface area for gas exchange between the lungs and bloodstream. Human lungs, for example, contain about 300 million alveoli. They give the lungs a total surface area for gas exchange of up to 90 square meters (968 square feet). That's about as much surface area as one side of a volleyball court! I am facing a new situation today: Two six graders learned about the lives of animals. Lori learned more about fish, while Dan learned more about mammals. Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which student learned more about the lungs of mammals?
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Answer: Dan

Please answer this: I read this background article the other day: The refraction of waves across boundaries operates similarly to the method by which tanks are steered. Tanks do not have a steering wheel. Instead, they have an accelerator to produce forward motion and separate brakes on each tread. The operator uses brakes on both treads at the same time in order to stop, but brakes on only one tread to turn the tank. By braking one side, the operator causes that side to slow down or stop while the other side continues at the previous speed, causing the tank to turn towards the slower tread. I am facing a new situation today: Benjamin is taking an Army training class and is learning to operate a tank. Today, he is in a tank with an instructor on a training course. Benjamin drives the tank forward and comes to a large dirt mound blocking his path. He needs to decide whether to break the left tread or right tread. Eric is operating a tank in a war zone. The battlefield is filled with large debris and needs to be navigated carefully. A large wall is blocking Eric's way forward and his right side. Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which tread should Eric slow to avoid the wall?
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Answer:
left