On the basis of relatively

Answer choices

1. A

   Too Strong: "guarantee"6% picked this

   Morphological differences between the members of two populations do not guarantee that the two populations do not belong

   In order to contradict this, the passage would have needed to say that morphological differences guarantee that the two populations are two different species. We can't find support for that strong an idea.

   6%
2. B

   Correct60% picked this

   The daily challenges with which an environment confronts its inhabitants are unique

   Why this is right

   We inferred from the conditional rule that Neanderthals and Cro-Magnons faced the same daily challenges (despite living in different environments). This answer contradicts that idea, saying that if you live in different environments, it's impossible to have the same daily challenges (each set of daily challenges is unique).

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

   60%
3. C

   Unsupported Comparison15% picked this

   There are greater morphological differences between Cro-Magnons and modern humans than there are between

   Unsupported Comparison: "Neanderthal's vs. Humans / CroMagnon's vs. humans" We weren't given any information allowing us to compare Neanderthals or Cro-Magnons to humans, so we can't speak to which group would have more morphological differences.

   15%
4. D

   Out of Scope15% picked this

   Use of similar tools is required if members of two distinct groups of tool-making hominids are to be considered

   Out of Scope: "same species, different tools" In order to contradict the idea that "X is required if Y is to be true", you'd need an example where Y was true, even though X was not. So in order for us to be able to contradict this answer, we would need to have an example where two groups of hominids were members of the same species, but they did not use similar tools. The stimulus only talks about two groups who did use similar tools, so we can't contradict this.

   15%
5. E

   Out of Scope Comparison4% picked this

   Through much of their coexistence, Cro-Magnons and Neanderthals were geographically isolated

   Out of Scope Comparison: "isolated vs. not isolated" This seems pretty compatible with the passage, since we know that these two groups lived in different environments. Maybe they were isolated, maybe not. We don't have a way to contradict it and show that the two groups definitely had geographic connections.

   4%