Logical ReasoningDifficulty: Hard

PT5 S1 Q7 Explanation

Two paleontologists, Dr. Tyson and Dr. Rees

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

TopicsAgree/Disagree

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Stimulus

Two paleontologists, Dr. Tyson and Dr. Rees, disagree over the interpretation of certain footprints that were left among other footprints in hardened volcanic ash at site G. Dr. Tyson claims they are clearly early hominid footprints since they show human characteristics: a squarish heel and a big toe immediately adjacent to the left foot to the right of the right foot, Dr. Rees rejects Dr. Tyson’s conclusion.

What this question is testing

Agree/Disagree

Setup

This is a classic Agree/Disagree setup — two scientists looking at the same evidence and reaching opposite conclusions.

Tyson

Tyson sees a squarish heel and a big toe right next to the next toe — that's how human feet are shaped — and concludes: hominid footprints.

Rees

Rees sees the same prints but notes that if hominids made them, they would have had to walk in a strange cross-stepping way. That's unexpected enough to reject the hominid hypothesis.

Evaluate

Notice neither of them denies the other's observation. They both see the human-like toes and the cross-stepping pattern. They just disagree about which feature is more important. Tyson says the toe shape settles it; Rees says the weird gait pattern overrides that.

Goal

The right answer will say their disagreement is about how to weigh different parts of the evidence.

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The question
7.

The disagreement between the two paleontologists is over which one of

Answer choices

  1. Correct56% picked this

    The relative significance of various aspects of

    Why this is right

    This nails the disagreement. Tyson and Rees both observe the human-like toe/heel features and the cross-stepping pattern. Their split is about which feature is weightier: Tyson treats the foot anatomy as decisive, Rees treats the unexpected gait as decisive. They disagree about the relative significance of the two aspects of the evidence.

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

  2. Both Agree9% picked this

    The assumption that early hominid footprints are distinguishable from

    Both paleontologists clearly assume that hominid footprints can be distinguished from other footprints — Tyson is making such a distinction by pointing to specific features, and Rees is doing the same by pointing to a feature that argues against hominid origin. They agree on this assumption, so it cannot be the disagreement.

  3. Both Agree15% picked this

    The possibility of using the evidence of footprints to determine the gait of the creature

    Both rely on the possibility of inferring gait from footprints. Rees explicitly draws an inference about how the maker would have walked (cross-stepping). Tyson's view is consistent with that practice too. Neither doubts that prints can tell us about gait.

  4. Half Scope14% picked this

    The assumption that evidence from one paleontologic site is enough to

    Neither paleontologist addresses how many sites are needed to support a conclusion. They are arguing about what the evidence at site G shows, not whether one site's evidence is sufficient. The debate is about feature interpretation, not sample size.

  5. Half Scope7% picked this

    The likelihood that early hominids would have walked upright on

    Neither paleontologist directly addresses how likely it is that early hominids walked upright on two feet. The disagreement is about what these specific footprints show, not about general hominid locomotion.

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