BIOL 108 Baltimore City Community College PCB in the Last Frontier Case Study Paper What scientific observation about PCB distribution is described in the

BIOL 108 Baltimore City Community College PCB in the Last Frontier Case Study Paper What scientific observation about PCB distribution is described in the attached document? Propose a hypothesis or “explanatory story” to explain the global movement of pollutants such as PCBs. Specifically, how could they end up in the most remote Alaskan lakes? Propose a method that could be used to test your hypothesis from Question 2. (Note: Your approach may be on a local scale despite examining a global phenomenon.)Use complete sentences in your response using APA format. please see attached document PCBs in the Last Frontier:
A Case Study on the Scientific Method
by
Michael Tessmer
Chemistry Department
Southwestern College, Winfield, KS
Part I—PCBs
Polychlorinated biphenyls (pcbs) are compounds that were
once used as insulators in electrical transmission lines and in
the production of polymers. Each pcb differs by the quantity
and location of the chlorine atoms. An example of one of the
many different pcbs is shown to the right.
pcb production was halted in  due to their potential
toxicity, but the chemicals are still found in the environment
due to their stability. Studies in remote areas of Alaska have
shown that pcbs can even be found in lakes untouched by
humans. There is no known natural process that produces
pcbs, so all of the pcbs in existence are presumed to have
been produced by humans.
2,2’,4,4’,5-Pentachlorobiphenyl
Questions
. What scientific observation about pcb distribution is described above?
. Propose a hypothesis or “explanatory story” to explain the global movement of pollutants such as
pcbs. Specifically, how could they end up in the most remote Alaskan lakes?
. Propose a method, either through observations or direct experimentation, which would test your
hypothesis from Question . (Note: Your approach may be on a local scale despite examining a
global phenomenon.)
“PCBs in the Last Frontier” by Michael Tessmer
Page 1

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