Some types of organisms originated

Answer choices

1. A

   Too Strong4% picked this

   Only organisms of types that originated through endosymbiosis

   We're barely comfortable supporting the idea that this nucleomorph is the product of endosymbiosis. We can support that idea, but we can't prove it. So this answer, which is saying that "if an organism contains a nucleomorphs, it must have originated through endosymbiosis" is too strong. This was an unusual nucleomorph. So, even if this one did originate through endosymbiosis, there's no reason to think that this would be true of all organisms that have nucleomorphs. Inference questions love to put an answer in slot (A) that is very close to what we were anticipating.

   4%
2. B

   Too Strong: all18% picked this

   A nucleomorph within the chlorarachniophyte holds all of the genetic material of

   Nothing in this paragraph says anything as strong as "contains all the genetic material of some other organism". Furthermore, we think the nucleomorph was from the "other organism" that got engulfed by the chlorarachniophyte during endosymbiosis. This answer seems to be positing a third organism. You have the chlora, which ate the nucleomorph, but then the nucleomorph ate some other organism and got all of its genetic material?

   18%
3. C

   Opposite Relationship12% picked this

   Nucleomorphs originated when an organism endosymbiotically engulfed

   We know that the nucleomorph was part of the organism that got engulfed (presumably by the chlorarachniophyte). This answer is saying that the chlorarachniophyte got engulfed by the nucleomorph.

   12%
4. D

   Too Strong: unless7% picked this

   Two organisms will not undergo endosymbiosis unless at least one of them

   There's no way from this passage to derive such a severe connection between endosymbiosis and nucleomorphs. We can support that this unusual nucleomorph had something to do with endosymbiosis (since we know it was part an organism that got engulfed). But we can't say, as this answer does, that every single case of endosymbiosis involves a nucleomorph.

   7%
5. E

   Correct60% picked this

   Chlorarachniophytes emerged as the result of two organisms having

   Why this is right

   Since we know that the nucleomorph is the remains of an engulfed organism's nucleus and now is within a chlorarachniophyte, it seemed supportable to say that the nucleo was in organism Y, which got engulfed during endosymbiosis by the chlora. The weird part about this answer, to me, was the idea that there were two separate organisms that combined into the chlora. But, if we check the wording of endosymbiosis, it is the origination of an organism. One organism engulfs another, and the engulfee is still a functioning part of the engulfer. But that doesn't mean the resulting organism is still called by the name of the engulfing organism. A new organism has originated from this process.

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

   60%