TASK DEFINITION: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
PROBLEM: Archaeologists say they have unearthed the oldest human footprints ever found in North America. The impressions were discovered buried at a shoreline at an archaeological dig site on Calvert Island, British Columbia in Canada. Charcoal in the prints has been radiocarbon dated, giving them an age of 13,200 years old. The finding was made by the Hakai Institute and the University of Victoria, both in British Columbia. Archaeologists Dr Daryl Fedje and Dr Duncan McLaren excavated an area below the high tide line, and found dozens of human footprints that had remained intact in clay. An ancient skeleton found nearly 20 years ago in a river in Washington is related to Native Americans, says a DNA study that could help resolve a long-running dispute over its ancestry.Human footprints were found preserved on Calvert Island in CanadaThey were radiocarbon dated to a remarkable 13,200 years oldIf confirmed they would be the oldest human footprints in North AmericaDiscovery also suggests people once migrated down the coast 
 Question:'There's no way to get to _ other than watercraft, and that applies to 13,000 years ago as it does today,' Dr McLaren said.

SOLUTION: Calvert Island

PROBLEM: (CNN) Your "BPA-free" plastic product may be no safer than the product it replaced, says a new UCLA study that analyzed the impact of a common BPA alternative on zebra fish embryos. The study joins a small but growing group of similar research sounding the alarm about so called "BPA-free" alternatives. "Our findings are frightening and important," said senior author and reproductive endocrinologist Nancy Wayne. "Consider it the aquatic version of the canary in the coal mine." After decades of animal research linked BPA (Bisphenol A), a known endocrine disruptor, to problems with brain and reproductive development, early puberty and a rise in breast and prostate cancer, many manufacturers stopped using the chemical to harden plastics, replacing it with "BPA-free" alternatives. The most common replacement is BPS (Bisphenol S), said Wayne.BPA-free alternatives may be no safer than BPA, say researchersMost common alternative, BPS, linked in study to disruptions of estrogen and thyroid hormones 
 Question:In addition to the effect on estrogen, the study also found both _ and BPS affected the thyroid hormone system.

SOLUTION: BPA

PROBLEM: Washington (CNN) Former Alaska Gov. Sarah Palin says the Black Lives Matter movement is a "farce" and said Americans who hyphenate their racial backgrounds -- such as African-Americans and Asian-Americans -- "further divide our nation." "#‎BlackLivesMatter‬ is a farce and hyphenating America destroys us," the 2008 Republican vice presidential nominee wrote on her Facebook page. "Shame on our culture's influencers who would stir contention and division that could lead to evil such as that in Dallas." "Shame on politicians and pundits giving credence to thugs rioting against police officers and the rule of law in the name of "'peaceful protests.' It is a farce. #BlackLivesMatter is a farce.""Shame on politicians and pundits giving credence to thugs rioting against police officers and the rule of law in the name of 'peaceful protests,'" Palin wrote"Self-descriptions that put any race in front of being an American are now used to further divide our nation," she wrote 
 Question:Palin's comments come after a week in which five Dallas officers were shot and killed amid protests over the back-to-back police shooting deaths of two _-American men by police earlier in the week.

SOLUTION:
African