It treats evidence for the absence of one condi- tion under which a circumstance would occur as conclusive evidence that that circumstance will not occur.
Evidence given to support the conclusion actually undermines it.
13. Although the prevailing supposition has been that it is too hot for microorganisms to survive deep below the Earths surface, some scientists argue that there are living communities of microorganisms there that have been cut off from surface life for millions of years. These scientists base their argument on the discovery of living microorganisms in samples of material that were taken from holes drilled as deep as 1.74 miles. The scientists argument depends on which of the fol- lowing assumptions?
The microorganisms brought up were of a species that is related to those previously known to science.
No holes have been drilled into the Earths surface to a distance deeper than 1.74 miles
The microorganisms did not come from surface soil that came into contact with the drilling equipment.
The stratum from which the samples came has been below the surface of the Earth ever since
the Earth came into existence.
The temperature at the bottom of the holes drilled was not significantly hotter than that of the hottest spots on the Earths surface.
14. For 20 years all applicants for jobs as technicians at EquipCorp were required to demonstrate that they could operate and repair the machinery that was central to EquipCorps manufacturing business. Now, however, that particular machinery is obsolete, and very different machinery fills the central role. Therefore, the old requirement is no longer a useful method for evaluating whether applicants for jobs as technicians at EquipCorp have the skills necessary for the job. Which of the following, if true, most strengthens the argument?
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