As usual, you've got some really insightful thoughts percolating here,
WaltGrace1983!
First, I think this question may need a formal breakdown of the core, so here it is:
PREMISE: PIE has words for 'winter', 'snow', and 'wolf'
PIE lacks word for 'sea'
CONCLUSION: Likely that PIE peeps lived in cold climate, without sea/ocean
You're absolutely right,
WaltGrace1983, that this argument is assuming that language can tell us something about the environment. I love the way that you've phrased that. Anything that undermined that connection would absolutely weaken this argument, and that's how answer
(B) steps up to the plate.
But I would caution you to realize that that is actually not the only assumption being made here! It's the assumption that is being explicitly tested in by the correct answer, but it's not the only one in the argument - and in fact, the two most dangerous answers are tempting precisely because of a *another* lurking assumption here.
So, even if we accepted the idea that language does indeed tell us something about environment, we'd also need to assume that these words (or lack) are the only words (or lack) that matter for a determination of cold climate/existence of sea/ocean. What if we found out the PIE peeps had a word for "whale"?! That would be decent evidence they had access to the ocean!
This is what makes
(A) and
(D) so tempting - at first glance, we might think these answers are undermining the conclusion
even accepting the assumption that language tells us something about environment. But on deeper inspection, "fish" and "heat", even if they reflect the environment, *still* wouldn't weaken the conclusion.
(A) Even accepting the assumption that language tells us something about environment, this just tells us that PIE peeps have fish. It makes us
think of "sea", but fish are basically everywhere there's water: rivers, lakes, streams, ponds, etc. Pretty much the only place where humans could hang out and NOT have any fish is the desert. So, even if PIE peeps HAD fish, that doesn't really suggest they have access to the
sea or ocean specifically.
Similarly, even accepting the assumption that language tells us something about environment,
(D) would just indicate that PIE peeps had heat. Well, I should hope so! If they didn't have heat, in any form, they'd probably be dead. While warm climate people might describe the heat
of the sun, cold climate people would probably describe the heat
of a fire, or body heat. So again, the idea that PIE people HAD heat doesn't suggest anything about the climate that they lived in.
If the only way to have "fish" was to be by the ocean, though,
(A) would be awesome! And if the only way to have "heat" was to be in a warm climate,
(D) would similarly be awesome! These answer choices WOULD have targeted a difference assumption than
(B) does, but that's okay - most LSAT arguments have more than one assumption going on.
In fact, the LSAT knows that the assumption that these are the only relevant words is the first one most people will pick up on. That's the entire reason they wrote
(A) and
(D) (but made sure they didn't actually undermine that assumption). Then, sneaky jerks, they wrote the correct answer to hinge on an entirely different assumption - the one we're less likely to notice right at the beginning.
On the nature of "some" in Weaken questionsThis is some great stuff here!
Notice what's really happening in the assumption - the argument is assuming that language is
enough information to allow us to draw a conclusion about environment. The assumption is inherently a conditional! "If [language] then [environment]". We want to damage that conditional. What do we need to call a conditional statement a liar? All we need to do is show that sometimes it doesn't work.
In other words, if an argument makes an assumption that one thing is enough to guarantee the conclusion, then showing that things just don't ALWAYS work that way absolutely damages that assumption.
Really great thoughts, and keep pushing yourself!