I read this background article the other day: Although some lipids in the diet are essential, excess dietary lipids can be harmful. Because lipids are very high in energy, eating too many may lead to unhealthy weight gain. A high-fat diet may also increase lipid levels in the blood. This, in turn, can increase the risk for health problems such as cardiovascular disease. The dietary lipids of most concern are saturated fatty acids, trans fats, and cholesterol. For example, cholesterol is the lipid mainly responsible for narrowing arteries and causing the disease atherosclerosis. I am facing a new situation today: Ronaldo and Jeff are two college roommates that have similar body structure and similar physical activity levels. Ronaldo is a nutrition enthusiast and eats a diet with appropriately low amounts of fat and cholesterol. Jeff, on the other hand, doesn't really care about nutrition at all. He eats whatever he wants, whenever he wants, and as a result he consumes a diet with an inappropriately high amount of fat and cholesterol. Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Who is more likely to gain unhealthy amounts of weight?
----
Answer: Jeff

I read this background article the other day: Rain dissolves fertilizer in the soil. Runoff carries it away. The fertilizer ends up in bodies of water, from ponds to oceans. The nitrogen is a fertilizer in the water bodies. Since there is a lot of nitrogen it causes algae to grow out of control. Figure below shows a pond covered with algae. Algae may use up so much oxygen in the water that nothing else can grow. Soon, even the algae die out. Decomposers break down the dead tissue and use up all the oxygen in the water. This creates a dead zone. A dead zone is an area in a body of water where nothing grows because there is too little oxygen. There is a large dead zone in the Gulf of Mexico. You can see it Figure below . I am facing a new situation today: Leaf farm and Plum farm provided the neighboring counties with quality produce year-round. plum farm used conventional farming methods such as fertilizer and pesticides, while Leaf farm used alternative eco-friendly methods only. Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which farm caused more fertilizer to reach the ponds?
----
Answer: Plum

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: Mike and John are brothers. Their dad sent them to the doctor's office to get tested for hepatitis because Mike was feeling sick all the time. It turned out Mike has hepatitis B, while John doesn't. Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which brother doesn't have a disease which causes yellowing of the eyes?
----
Answer:
John