Logical Reasoning

PT12 · S4 · Q21 Some people fear that global warming

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

  • 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

Start practicing free

Some people fear that global warming will cause the large ice formations in the polar seas to melt, thereby warming the waters of those seas and threatening the plankton that is crucial to the marine food chain.

Your task

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

Common trap

Answers that look negative but attack a claim the argument never relied on.

Winning move

Find the assumption the argument depends on, then pick the choice that undermines it.

21.

Which one of the following, if true, most seriously undermines the scientists’ contention?

  1. Much of the marine plant

    Trap

    3% picked this

  2. The overall effect of the

    Trap

    6% picked this

  3. The mean air temperature above

    Trap

    0% picked this

  4. Correct

    The temperature of water that

    Why this is right

    Answer D is correct.

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

    89% picked this

  5. The mean temperature of ocean

    Trap

    1% picked this

Continue the review in LSAT Lab

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

Save and practice this skill
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