Question ID:PT92 S1 Q23 Passage:On Earth, biological activity leads to a change in the ratio of isotope S-34 to isotope S-32. However, a newly discovered meteorite of Martian origin exhibits ratios of these elements found only in terrestrial minerals dating from before the beginning of life on Earth. Therefore, it is unlikely that life occurred on Mars. Stem:Each of the following, if true, would weaken the argument EXCEPT: Correct Answer Choice:CChoice A:Life forms that have a different effect on the ratio of S-34 to S-32 from that of life forms on Earth could have evolved elsewhere. Choice B:The effects of life on the ratio of S-34 to S-32 depend on a number of climatic and environmental factors with regard to which Earth and Mars differ. Choice C:The ratio of S-34 to S-32 in the meteorite is the same as that on Mars as a whole at the time that the material in the meteorite left Mars. Choice D:Relatively few terrestrial mineral samples contain S-34 and S-32 in the ratio that indicates the presence of biological activity. Choice E:The current ratio of S-34 to S-32 on Mars is different from that at the time the material in the meteorite left Mars.