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News article in a popular business publication

June 7 - If current trends continue, farmed seafood will overtake ocean fishing as the world's largest source of seafood by 2025. Aggressive overfishing of the world's oceans and the inability of world governments to agree on fishing limits mean that farming will become critical to the industry's ability to meet worldwide seafood demand. Additionally, recent concerns about mercury levels in wild-caught fish have led many consumers to prefer farmed fish, further creating increased demand for this relatively new source of seafood.
Interview with a well known scientist in a technology journal

July 2 - Dr. Jason Dempster, one of the world's most outspoken critics of the seafood industry's unwillingness to curb its output in order to protect the fish population, suggests that more than two dozen popular species may become virtually extinct in the next several decades.

"I understand that consumers keep buying the seafood, and fishermen are naturally going to meet demand wherever they can find it. However, if something isn't done to meet the demand another way, by the middle of this century even something as common as tuna may become a delicacy only the world's wealthiest families can afford."
Article from a weekly news magazine

July 20 - Demand for tilapia, one of the world's most popular species of fish, has grown 1000% over the last decade as people around the world have discovered it as a low-cost fish that goes well with a variety of foods. This increased demand has encouraged countless tilapia farms to open in China, and American officials have expressed concern that not all tilapia imported from China meets U.S. safety standards. Some experts in the U.S. have called for creating more stringent standards for all seafood imports, but Chinese authorities warn that this may dramatically increase the cost of seafood imported into the United States.


YesNo 
 The world's governments usually do not agree with one another on how to deal with matters related to fishing and seafood farming.
 An increase in worldwide demand for tilapia has driven the world's ocean fish population to dangerously low levels.
 Dr. Dempster supports an increase in fish farming.
 Chinese tilapia farms have led some U.S. consumers to worry about the levels of mercury in their seafood.

  1. NO. While the first article notes that the world governments have been unable to agree on fishing limits, that does not necessarily mean that such disagreements are usually the case. Because this current situation could potentially be a unique occurrence, the statement in question is not necessarily true, and therefore not a valid conclusion just based on the information provided.

  2. NO. Article 3 discusses the large increase in demand for tilapia, but it does not indicate whether the ocean tilapia population has been threatened; in fact, the article only mentions farmed tilapia as a consumer product, so we cannot conclude anything about the ocean population.

  3. NO. In article 2 Dr. Dempster is quoted as opposing the current fishing output, in order to "to protect the fish population". This does not necessarily mean that he favors farming, however; his comments are specific to fishing and not to farming, so we cannot make any inferences as to his opinions on farming.

  4. NO. Mercury levels are only mentioned (in article 1) as a concern relevant to wild-caught fish, not farmed fish. While article 3 does mention that American officials are concerned over safety standards with regard to China's fish farms, the article does not indicate whether mercury is one of those safety concerns.