Logical ReasoningDifficulty: Easy

PT120 S4 Q2 Explanation

Dr. Theresa Pagano, a biologist,

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

TopicsStrengthen

Keep going in LSAT Lab

  • Save & drill this skill build targeted practice sets from questions like this one

  • Video walkthroughs watch every question solved step by step

  • 81 official LSATs as questions, timed sections & full-length tests

Full official LSAT questions are available through LawHub. This page provides LSAT Lab's explanation, strategy, and review tools without republishing the full official question.

Stimulus

Dr. Theresa Pagano, a biologist, has found that the checkerspot butterfly is becoming more prevalent in regions farther north than before and less prevalent in regions farther south. The northward shift of the butterflies is almost perfectly correlated with the northward shift of the warm zones in the global climate, climate is responsible for the northward movement of the butterflies.

What this question is testing

Strengthen

Your task

Find the choice that makes the argument's conclusion more likely to be true.

Common trap

Answers that are consistent with the argument but add no real support, or that strengthen a claim the argument doesn't make.

Winning move

Locate the gap between evidence and conclusion, then pick the choice that closes it.

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

The question
2.

Each of the following, if true, supports Dr. Pagano’s

Answer choices

  1. Strengthens2% picked this

    Checkerspot butterfly colonies observed under laboratory conditions are critically affected by

    This states that in lab conditions, butterfly colonies are critically affected by small temperature changes, heightening the plausibility that climate-induced temperature shifts impact their movement.

  2. Strengthens4% picked this

    Climate does not affect checkerspot butterflies themselves directly, but the plants they depend on thrive

    This makes the author's hypothesis more plausible. While climate change doesn't directly affect the butterflies, it influences their food sources, which thrive in warm climates. It indirectly supports the hypothesis by linking climate change to butterfly movement through their dependency on plants.

  3. Correct88% picked this

    Experimental evidence suggests that the checkerspot butterfly can adapt easily to a wide range of

    Why this is right

    This suggests that the Checker Spot Butterfly can adapt easily to various temperatures and conditions, which does nothing to strengthen, and may even undermine the idea that a warming shift would make enough different to influence the butterfly's habitat.

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

  4. Strengthens2% picked this

    In recent years, abnormally low average temperatures have been correlated with a reduced

    This provides data showing fewer butterflies in lower temperatures, backing the idea that higher temperatures are favorable, and supporting the causal link between climate change and their movement. Since the author thinks warmer temps in the north led to more butterflies, this is the classic "no cause / no effect" strengthener, where an absence of warmth goes hand in hand with an absence of butterflies.

  5. Strengthens4% picked this

    Several studies have shown that several other species of butterfly closely related to the checkerspot butterfly survive

    This boosts the plausibility of the author's hypothesis, noting that closely related butterfly species only survive in warm climates, offering analogous reasoning to support the idea that checkerspot Butterflies might similarly require warm climates.

Continue the review in LSAT Lab

Save this question, watch the video walkthrough, and drill similar questions in your LSAT Lab account.

LSAT Lab

Turn this review into a targeted study plan.

Save this question, drill more like it, watch the video walkthrough, and track your progress in your LSAT Lab account.

Start practicing free