30 LR One Question 22
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It's precisely the opposite of what we need (not common for a Necessary Assumption answer, but notice that this mirrors the anticipated wrong strengthen response to a Weaken question!).
We must know that they do not molt less frequently as they age (if they did, then our argument would be stupid—there'd be no way for the rings to tell us how old they are!).
I ended up spending way to much time trying to figure out this question. After listening to your explanation I understand now why A is incorrect but is there a faster way in getting a question like this done?
I think your negate test would serve you well here—say that all rattles are not identical. What effect would that have on the argument?
That it has none is perhaps the clearest indicator that (B) is not necessary here.