Reading ComprehensionDifficulty: Medium

PT111 S2 P3 Q15 Explanation

Biology and Universal Laws

A free, expert breakdown of this official LSAT Reading Comprehension question.

TopicsMain PointScience

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Passage

Philosophers of science have long been uneasy with biology, preferring instead to focus on physics. At the heart of this preference is a mistrust of uncertainty. Science is supposed to be the study of what is true everywhere and for all times, and the phenomena of science are supposed to be repeatable, interested in how elephants and mice got to be such different sizes in the first place.

Philosophers of science have not been alone in claiming that science must consist of universal laws. Some evolutionary biologists have also acceded to the general intellectual disdain for the merely particular and tried to emulate physicists, constructing their science as a set of universal laws. In formulating the notion of a universal life, and they have raised the possibility that historical contingency is an integral factor in biology.

To illustrate the difference between biologists favoring universal, deterministic laws of evolutionary development and those leaving room for historical contingency, consider two favorite statements of philosophers (both of which appear, at first sight, to be universal assertions): “All planets move in ellipses” and “All swans are white.” The former is truly universal necessary consequence of the laws governing the motion of objects in a gravitational field.

Biological determinists would say that “All swans are white” is universal in the same way, since, if all swans were white, it would be because the laws of natural selection make it impossible for swans to be otherwise: natural selection favors those characteristics that increase the average rate of offspring production, and of evolutionary theory has been the history of the struggle between these two views of swans.

What this question is testing

Main Point

Topic

The author is comparing how philosophers think about physics vs. biology — and explaining why physics has been the favorite.

Framework

Present Debate. The author shows you the preference, traces it, and then surfaces the recent biology-side pushback.

Main Point

The simpler version: philosophers of science love physics because physics deals in big, universal "this happens everywhere, always" laws. Biology is messier — it has history baked into it. Some biologists tried to make their field look more like physics, but lately others have started saying,

P1: The preference, explained

Philosophers want science to be about universal, repeatable stuff. So they're fascinated by physics laws (everything falls at the same rate) but bored by biology questions (why are mice and elephants different sizes?). They distrust history.

P2: Two kinds of biologists

One kind tried to copy physics — looking for biology's "law of gravity" (a universal struggle for existence, constant DNA evolution rate). The other kind, more recently, asks whether biology really runs on universal laws or whether contingency is part of the deal.

P3: A real universal law

"All planets move in ellipses" really is universal. It applies to planets that don't even exist yet — the laws of gravity force the shape.

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

The question
15.

Which one of the following best summarizes the main idea of

Answer choices

  1. Out of Scope6% picked this

    Just as philosophers of science have traditionally been reluctant to deal with scientific phenomena that are not capable of being explained by known physical

    Out of Scope: shy away from philosophy The passage never once talked about biologists being reluctant to confront philosophical questions.

  2. Correct75% picked this

    While science is often considered to be concerned with universal laws, the degree to which certain biological phenomena can be understood as arising from

    Why this is right

    The main clause is, "the degree to which [biology] can be understood as arising from [universal] laws is currently in dispute". That looks super appealing, given our Present Debate framework. It's correctly identifying the central issue being debated by Determinist Biologists vs. Nondeterminist Biologists: can biology really be expressed in universal laws? The opening clause here seems like a nod to the somewhat extraneous discussion in the first paragraph, which emphasizes the traditional bias of philosophers of science that science should be the study of what is true everywhere and for all times (i.e. universal laws).

    Skill tested: Main Point · how this choice captures the passage's function is the move to repeat next time.

  3. Wrong Emphasis Opposite, if anything15% picked this

    Although biologists have long believed that the nature of their field called for a theoretical approach different from that taken by physicists, some biologists

    The main clause here is "some biologists have recently begun to emulate the methods of physicists". Since we're trying to match the last sentence of the 2nd paragraph, we'd want the main point to sound like, "some biologists have recently begun to question whether biology can really be expressed in universal laws (the way that physics is)." Since these recent biologists are pessimistic that biology can be expressed in universal laws, they are definitely not trying to emulate the methods of physicists.

  4. Wrong Emphasis1% picked this

    Whereas physicists have achieved a far greater degree of experimental precision than has been possible in the field of biology, the two

    The main clause here is "physics and biology employ similar theoretical approaches". That is nowhere close to what we want, which is "determinist and nondeterminist biologists are debating whether biology can really consist of universal laws".

  5. Wrong Emphasis2% picked this

    Since many biologists are uncomfortable with the emphasis placed by philosophers of science on the need to construct universal laws, there has been

    The main clause here is "there has been little interaction between biology and philosophy of science". That is nowhere close to what we want, which is "determinist and nondeterminist biologists are debating whether biology can really consist of universal laws". The fact that determinist biologists are allied with philosophers of science in this debate also sort of works against what this answer choice is actually saying.

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