user: Q: I read this background article the other day: Ecologically, the expansion of drainage systems has had tremendous negative effects. Hundreds of thousands of wetland species experienced significant population declines as their habitat was increasingly fragmented and destroyed. Although market hunting within the Central Flyway was a contributing factor in the decline of many waterfowl species' numbers in the early decades of the twentieth century, loss of breeding habitat to agricultural expansion is certainly the most significant. Early maps of midwestern states depict many lakes and marshes that are either nonexistent or significantly reduced in area today. Channelization, a related process of concentrating and facilitating the flow of water from agricultural areas, also contributed to this degradation.  I am facing a new situation today: Timber village started a channelization process by draining all the swamps near their village. Hill village situated 10 miles to the south, left their swamps untouched.  Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which village experienced no decline in waterfowl species?
A: Hill

Q: I read this background article the other day: Carbon dioxide is the most significant long-lived greenhouse gas in Earth's atmosphere. Since the Industrial Revolution anthropogenic emissions – primarily from use of fossil fuels and deforestation – have rapidly increased its concentration in the atmosphere, leading to global warming.  Carbon dioxide also causes ocean acidification because it dissolves in water to form carbonic acid.  I am facing a new situation today: Ted and Larry studied environmental sciences. They are learning about greenhouse gasses this week. Ted reads about carbon dioxide, while Larry reads about methane gas.  Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which student read less about the most significant long-lived greenhouse gas in Earth's atmosphere?
A: Larry

Q: I read this background article the other day: Because of its temperature, the atmosphere emits infrared radiation. For example, on clear nights Earth's surface cools down faster than on cloudy nights. This is because clouds (H2O) are strong absorbers and emitters of infrared radiation. This is also why it becomes colder at night at higher elevations.  I am facing a new situation today: David was visiting Europe last summer. First he visited London. To his dismay, it was overcast all night. Then he flew to Rome. There the sky was as clear as you could get at night. David was very happy about it.  Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: In which place less ifrared radiation would be emitted at night, London or Rome?
A: Rome

Q: I read this background article the other day: Hepatitis B is a disease of the liver. It is caused by a virus called hepatitis B, which can be passed through sexual activity. Hepatitis B causes vomiting. It also causes yellowing of the skin and eyes. The disease goes away on its own in some people. Other people are sick for the rest of their lives. In these people, the virus usually damages the liver. It may also lead to liver cancer. Medicines can help prevent liver damage in these people. There is also a vaccine to protect against hepatitis B.  I am facing a new situation today: Jennifer and Maria both had unprotected sex with the same man. This man, unbeknownst to them, has hepatitis b. Both women go to the doctor to get checked out. Jennifer reports that she is coughing frequently and has a congested nose. The doctor notices that Maria has yellow eyes and she tells the doctor that she has been throwing up.  Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Who will probably not be prescribed medicine for their liver?
A:

assistant: Jennifer