A geologist recently claimed

Answer choices

1. A

   No Impact10% picked this

   No known form of bacteria is complicated enough in structure to engage in a sexual

   Whether known bacteria engage in sexual reproduction is irrelevant to whether nanobes are alive. The argument's reasoning is about reproductive mechanisms in general, not about the specific type of reproduction. Even if no bacteria reproduce sexually, bacteria still reproduce (through binary fission, budding, etc.), and the argument claims nanobes cannot reproduce at all because they are too small to contain any reproductive mechanism. The type of reproduction bacteria use does not bear on whether nanobes can contain the machinery for any form of reproduction. This answer addresses the wrong dimension of the reproduction question.

   10%
2. B

   Correct59% picked this

   Single-celled creatures can combine to form a multicelled structure and then reproduce before they disband into

   Why this is right

   This answer demolishes the argument's key assumption: that a reproductive mechanism must be contained within a single nanobe. If single-celled creatures can combine to form a multicellular structure and then reproduce before separating, the same possibility could apply to nanobes. Individual nanobes might be too small to contain a reproductive mechanism on their own, but they could combine into a larger aggregate that is large enough to house the necessary machinery. This means nanobes could be living organisms that reproduce collectively rather than individually — the reproductive mechanism exists at the group level, not the individual level. The argument assumed that reproductive capacity must reside within each individual entity. This answer shows that assumption is wrong by demonstrating an established precedent: single-celled organisms that reproduce through temporary multicellular assembly. If this mechanism applies to nanobes, their small size no longer precludes life.

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

   59%
3. C

   No Impact13% picked this

   The material phenomena that some scientists claim are the fossilized remains of bacteria in meteorites from Mars are approximately

   Whether some phenomena claimed to be fossilized bacteria are actually mineral formations has no bearing on whether nanobes are alive. This answer addresses a separate scientific controversy about paleontological identification, not the specific question of whether nanobes' size precludes them from being living organisms. Even if fossilized bacteria claims are sometimes wrong, that does not tell us anything about whether nanobes can reproduce. The argument's reasoning is about size and reproductive capacity, not about the reliability of fossil identification. This answer is about a different scientific debate entirely.

   13%
4. D

   No Impact17% picked this

   Previous definitions of life were based on research done with inferior microscopes no

   Previous definitions of life being based on inferior microscopes is an interesting historical note that does not weaken the argument. The argument does not rely on older definitions of life — it relies on the premise that reproduction is a prerequisite for life, which is not dependent on microscope quality. Whether older microscopes could detect nanobes is irrelevant; the question is whether nanobes can reproduce, and microscope quality does not determine reproductive capacity. Even if definitions of life have evolved as technology improved, the current argument's logic (too small for reproduction, therefore not alive) stands or falls on the size-reproduction relationship, not on how life was defined in the past.

   17%
5. E

   No Impact1% picked this

   Animals such as cold-blooded lizards can be physiologically simpler, though still larger,

   Cold-blooded lizards being physiologically simpler than some single-celled organisms is an interesting biological fact, but it does not address the argument's core issue. The argument claims nanobes are too small for a reproductive mechanism. Lizards, being far larger than nanobes, bacteria, or any single-celled organism, face no size constraints on housing reproductive machinery. The fact that lizards can be simpler than single-celled organisms while being larger tells us nothing about whether something as small as a nanobe can contain reproductive machinery. Simplicity is not the issue — physical size is. A large, simple organism can easily contain reproductive systems; the question is whether an extremely tiny entity can, regardless of its complexity.

   1%