Scientist: Physicists claim that their system of careful peer review prevents scientific fraud in physics effectively.
Conclusion
It would be good for progress in physics if they enhanced their safeguards against scientific fraud.
Evidence
Even though physicists claim their fraud-protection system is good because of peer review, we heard that same thing from biologists 20 years ago who turned out to be wrong. Since biology started strengthening it's fraud-protection guardrails, it's had fewer major incidents of fraud.
Evaluation
This is an argument by Comparison, since the author is leaning on Premises about biologists to make an argument about what physicists should do. To weaken an argument by comparison, we'd look for important differences: - maybe biologists were wrong 20 years ago when they said "we have good fraud-prevention systems" but physicists are correct now when they claim they do - maybe biologists didn't use peer review until recently, but peer review is the secret to fraud prevention.
To strengthen the comparison, we would want to know that physicists now and biologists-20 years ago are fair to compare in terms of their rate of fraud, their protection against fraud, and the sort of measures that would help prevent fraud.
However, we could also dig into the "New Term" in the conclusion: progress.
It's not really clear where that enters the discussion. We were just talking about whether or not fraud was being effectively prevented, until the author said,
Goal
The main thrust seems to be an argument by comparison, so we would look for a correct answer that makes biology and physics more fair to compare, when it comes to this fraud prevention discussion. But it's possible LSAT will test us on that "new guy" in the conclusion: progress. Is progress related to fraud prevention? A correct answer could help us believe that it is.