Scientists hypothesize that a particular

Answer choices

1. A

   Weaker Impact10% picked this

   Adults whose diets lack P-fat tend to have worse eyesight than those whose diets are

   This might be good enough to keep on a first pass because it does establish another correlation between P-fat and good eyesight. But this argument is specifically about the development of eyesight, as in, how little humans end up with eyes that see. It's not about the maintenance of good eyesight throughout our lifetimes. We also don't know to what extent adults can even absorb dietary P-fat, so this one is weak for a few different reasons.

   10%
2. B

   Correct76% picked this

   A fetus typically receives high levels of P-fat from the mother during only the last

   Why this is right

   This matches our prediction and connects the second piece of evidence about the premature births to the acquisition of P-fat. If it's true that we only get high levels of P-fat from mama in the last month before birth, we can reasonably infer that coming out 5-6 weeks early would result in lower P-fat levels than full-term babies have. This supports the hypothesis by establishing that the correlation between better eyesight and a longer stay in the womb is also correlated with higher P-fat levels.

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

   76%
3. C

   Irrelevant Comparison: babies / mothers4% picked this

   Babies whose mothers have poor eyesight do not tend to have

   This argument hinges on how one group of babies compares to another group of babies. Comparing babies to their mothers is irrelevant. This answer might be tempting if we see it as ruling out an alternate cause for poor eyesight: it's not the lack of P-fat, it's mom's bad eyes that make baby's eyes bad. But that's a stretch. All this shows is the lack of a correlation. It doesn't go far enough to rule out a non-P-fat cause for eyesight issues.

   4%
4. D

   Out of Scope: preference0% picked this

   Babies generally prefer mother’s milk to formulas low

   What babies prefer is irrelevant. This has no impact on our argument.

   0%
5. E

   Opposite (if Anything)9% picked this

   The eyesight of a fetus develops during the last trimester

   If eyesight develops late in the pregnancy, maybe the reason the premature infants had bad eyesight wasn't about P-fat at all? Maybe it was just a matter of time: they didn't stay in utero long enough for their eyesight to develop.

   9%