I think where I went wrong with A was that I misunderstood what A was saying; it is not saying that the less antibiotic resistance you have, the lower the metal concentration. A few problems I have found with it:
- mentions lower heavy metal resistance, not metal concentration (lower metal resistance doesn't have to imply lower metal concentration where the bacteria are)
- mentions bacteria in general, not bacteria in sewage (so not very analogous)
Aside from those flaws with this answer choice, would it have strengthened the argument if it was reworded to say, "Most bacteria that survive sewage waste and have weak antibiotic resistance came from sewage waste that does not contain high concentrations of heavy metals?"
In my mind, this answer choices would be doing something similar to B, which is affirming that the correlation between antibiotic resistance and heavy metal concentration is positive, such that lower levels of metals contribute to lower levels of antibiotic resistance. Although B of course is the better answer as it suggests a controlled experiment with metal concentration as a cause (and not just something correlated with antibiotic resistance).
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I think where I went wrong with A was that I misunderstood what A was saying; it is not saying that the less antibiotic resistance you have, the lower the metal concentration. A few problems I have found with it:
- mentions lower heavy metal resistance, not metal concentration (lower metal resistance doesn't have to imply lower metal concentration where the bacteria are)
- mentions bacteria in general, not bacteria in sewage (so not very analogous)
Aside from those flaws with this answer choice, would it have strengthened the argument if it was reworded to say, "Most bacteria that survive sewage waste and have weak antibiotic resistance came from sewage waste that does not contain high concentrations of heavy metals?"
In my mind, this answer choices would be doing something similar to B, which is affirming that the correlation between antibiotic resistance and heavy metal concentration is positive, such that lower levels of metals contribute to lower levels of antibiotic resistance. Although B of course is the better answer as it suggests a controlled experiment with metal concentration as a cause (and not just something correlated with antibiotic resistance).