Logical ReasoningDifficulty: Hard

PT109 S1 Q20 Explanation

Recently discovered prehistoric rock paintings

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsWeaken

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Stimulus

Recently discovered prehistoric rock paintings on small islands off the northern coast of Norway have archaeologists puzzled. The predominant theory about northern cave paintings was that they were largely a description of the current diets of the painters. This theory cannot be right, because the painters must have needed to eat the from the islands, and there are no paintings that unambiguously depict such creatures.

What this question is testing

Weaken

Setup

The popular theory says cave paintings show what the painters ate. The author tries to disprove that for these newly found island paintings: he says the painters had to eat sea animals to make it to the islands and back — but they didn't paint sea animals. So the diet theory must be wrong here.

Evaluate

To weaken this argument against the theory, an answer needs to either:

(a) explain why the painters didn't actually need to eat sea creatures (so it's no surprise they didn't paint them), or

(b) explain why sea creatures might have been painted but those paintings aren't around now.

The right answer to "EXCEPT" is the one that does neither — leaves the gap between "needed to eat sea creatures" and "no paintings of sea creatures" intact.

Goal

Find the answer that doesn't address either side of that gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
20.

Each of the following, if true, weakens the argument against the predominant theory about northern

Answer choices

  1. Weakens8% picked this

    Once on these islands, the cave painters hunted and ate

    If, once on the islands, the painters hunted and ate land animals, then their current diet (the diet during the time they were painting) didn't feature sea creatures. The diet theory says paintings reflect the current diet — and a current diet of land animals is consistent with paintings of land animals and no paintings of sea creatures. The author's argument against the theory is weakened. (This answer does weaken, so it's NOT the correct answer to the EXCEPT question.)

  2. Weakens17% picked this

    Parts of the cave paintings on the islands did not survive

    If parts of the cave paintings did not survive the centuries, then sea-creature paintings might have once existed and been lost. The author's "no paintings unambiguously depict sea creatures" claim is about the surviving record — and the surviving record may not represent what was originally painted. This weakens the argument against the theory. Not the EXCEPT answer.

  3. Correct49% picked this

    The cave paintings that were discovered on the islands depicted many

    Why this is right

    This answer does not weaken the argument against the theory. The author's argument hinges on the absence of unambiguous sea-creature depictions. Saying the paintings depicted many land animals is fully consistent with that absence — having lots of land-animal paintings doesn't fill in any sea-creature paintings. The author's key claim ("no paintings unambiguously depict such creatures") survives intact. Since this doesn't weaken, it's the correct answer to the EXCEPT question.

    Skill tested: Weaken · how this choice captures the argument's function is the move to repeat next time.

  4. Weakens18% picked this

    Those who did the cave paintings that were discovered on the islands had unusually advanced

    If the painters had advanced techniques for preserving meats, they could have brought enough preserved land-animal meat for the journey and not needed to eat sea creatures along the way. That breaks the author's premise that they "must have needed to eat the sea animals." Weakens the argument against the theory. Not the EXCEPT answer.

  5. Weakens8% picked this

    The cave paintings on the islands were done by the original inhabitants of the islands who ate the

    If the paintings were done by the islands' original inhabitants — who ate land animals — then those particular painters never made the long sea journey and never needed to eat sea creatures. Their current diet was land-based, and the absence of sea-creature paintings is what the diet theory predicts. The author's journey-based argument doesn't apply. Weakens the argument against the theory. Not the EXCEPT answer.

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