medium · LSAT Logical Reasoning
A scientist observes that whenever a certain chemical is present in a lake, the fish population declines. She concludes that the chemical is toxic to the fish.
Which one of the following, if true, most weakens the scientist's conclusion?
- The chemical is a byproduct of an algae species that blooms only when water temperatures climb to levels independently fatal to fish
- Other researchers have shown the chemical to be harmless to birds and mammals
- The chemical also appears, at much lower concentrations, in lakes with stable fish populations
- The decline in fish was steeper on the lake's northern shore than on its southern shore
- The chemical breaks down completely within a few weeks of entering the water
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More LSAT Logical Reasoning practice
- Which one of the following is an assumption required by the argument?
- Which one of the following can be properly inferred from the statements above?
- The question type just described is best identified as which one of the following?
- The reasoning in the argument is flawed in that the argument
- The reasoning in the argument is flawed because the argument
- Which one of the following most accurately describes the relationship the statement establ
- Which one of the following can be validly inferred from the two conditionals above?
- Which one of the following must be true given the statement above?