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Gmat750aspirant
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Since Statement 2 only gives the % concentration and not the ratio which researchers have hypothesis that a certain ratio stabilise human respiration, thus it has insufficient information.
NoeticImbecile
can someone explain why is B only not sufficient
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Actually, isn't Statement (1) alone sufficient to answer the question in the negative? The statement establishes that Xyphor-7’s atmosphere contains 20% Element-Z (an 80:20 ratio). Statement (1) provides the specific requirement for stable human respiration: a 19:1 ratio, which equates to exactly 5% Element-Z. Since the actual atmospheric concentration of Element-Z (20%) is four times higher than the respiratory requirement (5%), we can conclude from Statement (1) alone that the atmosphere would not support human respiration, thus making normal survival and function impossible. We don't need the neurological thresholds from Statement (2) if the human cannot breathe to begin with.
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