The fabric dye Alidin was recently reformulated to eliminate certain solvents known to cause damage to the ozone layer. When a factory in Bouvierville started to use the reformulated version of Alidin, several workers contracted serious lung ailments. The manufacturer of Alidin denied that the reformulated product could be the cause of the ailments since numerous other factories had also started to use it, and none of their workers had suffered any ill effects.
Which of the following, if true, most seriously weakens the dye manufacturer's argument?
To prevent a newly built dam on the Chiff River from blocking the route of fish migrating to breeding grounds upstream, the dam includes a fish pass, a mechanism designed to allow fish through the dam. Before the construction of the dam and fish pass, several thousand fish a day swam upriver during spawning season. But in the first season after the project's completion, only 300 per day made the journey. Clearly, the fish pass is defective.
Which of the following, if true, most seriously weakens the argument?
To prevent a newly built dam on the Chiff River from blocking the route of fish migrating to breeding grounds upstream, the dam includes a fish pass, a mechanism designed to allow fish through the dam. Before the construction of the dam and fish pass, several thousand fish a day swam upriver during spawning season. But in the first season after the project's completion, only 300 per day made the journey. Clearly, the fish pass is defective.
Which of the following, if true, most seriously weakens the argument?