PT17.S2.Q20 - until about 400 million years ago

goalis180goalis180 Alum Member
edited January 2016 in Logical Reasoning 531 karma
http://7sage.com/lsat_explanations/lsat-17-section-2-question-20/
B is the answer, and the only reason I did not choose it is because it required me to make an assumption that 1. Plankton are not fish (which would require some background knowledge of what plankton are), and 2 particles from the from the mud did not contain fish. Can someone explain this question to me from a different perspective please. Answer A is easy to come by if I knew I was allowed to make such assumptions.

Comments

  • nicole.hopkinsnicole.hopkins Inactive Sage Inactive ⭐
    7965 karma
    Which PS is this in? Can't seem to find it...
  • goalis180goalis180 Alum Member
    531 karma
    this question is from PT 17 S2 Q20
  • nicole.hopkinsnicole.hopkins Inactive Sage Inactive ⭐
    7965 karma
    ps = problem set :) PT17 isn't in the 10 actuals books
  • goalis180goalis180 Alum Member
    531 karma
    Ohhh sorry I have pt 17 a hard copy, but let me check.
  • goalis180goalis180 Alum Member
    531 karma
    MBT problem set 5
  • c.janson35c.janson35 Free Trial Inactive Sage Inactive ⭐
    2398 karma
    I think it's common knowledge that plankton are not fish (think: SpongeBob), so there is no assumption you have to make here. Also, it would be a huge stretch to believe that the "food particles from bottom mud" contained fish. In any case, B says that jawless fish did not PREY upon other fish. The jawless fish had only 2 means of eating, neither of which were preying on other fish; furthermore, the stim tells us that the development of a jaw changed their lives dramatically because jaws *allowed* them to actively pursue prey. It is the jaws that allowed him to prey upon other fish, so the jawless fish could not have preyed upon other fish.
  • goalis180goalis180 Alum Member
    531 karma
    Yea, I might have been too analytical with this question, the answer just seemed too easy.
  • nicole.hopkinsnicole.hopkins Inactive Sage Inactive ⭐
    7965 karma
    @c.janson35 said:
    think: SpongeBob
    I believe this is an instance of employing outside knowledge that LSAT clearly wants us to indulge.
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