Q11 according to the passage human activity has had

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Q11: According to the passage, human activity has had which of the following effects on salmon populations? A. An increase in the size of salmon populations in some previously polluted rivers B. A decline in the number of salmon in some rivers C. A decrease in the number straying salmon in some rivers D. A decrease in the gene flow between salmon populations that spawn in polluted streams and populations that spawn in pristine streams E. A decline in the vulnerability of some salmon populations to the effects of naturally occurring habitat destruction Answer: -------------------------------------------------------------------------------- Q12: The author mentions the “aftermath of the Mount Saint Helens eruption” (lines 73-74) most likely in order to ------------------------------------------------------------------------------------------------------------ Q13: In the United States, of the people who moved from one state to another when they retired, the percentage who retired to Florida has decreased by three percentage points over the past ten years. Since many local businesses in Florida cater to retirees, this decline is likely to have a noticeably negative economic effect on these businesses. 21
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Which of the following, if true, most seriously weakens the argument? ------------------------------------------------------------------------------------------------------------
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