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We are told that endosymbiosis is "the engulfing of one organism by another so that a part of the former becomes a functioning part of the latter." We know that an unusual nucleomorph has been discovered within a plant known as a chlorarachniophyte. Two types of a specific gene have been found in the DNA of this nucleomorph, and the argument explains that "one would expect to find only a single version of this gene if the nucleomorph were not the remains of an engulfed organism's nucleus." So, we diagram the last sentence: P: not NREON ==> SVG not SVG ==> NREON We know that we have two types of a specific gene, i.e. "not SVG,"--not only a single version of this gene. So, we know that the nucleomorph is the remains of an engulfed organism's nucleus, i.e. is a byproduct of endosymbiosis, which is answer choice (E): "Chlorarachniophytes emerged as the result of two organisms having undergone endosymbiosis." Hope that clears things up! Please let us know if you have any other questions.

Thanks a lot!!!

Hi I get why the answer is correct, but the mistake I made why I didnt pick (e) was because I thought (E) which states "Chlorarachniophytes emerged as the result of two organisms having undergone endosymbiosis" would require me assuming that the plant known as a chlorarachniophyte was not an anomaly of the species and representative of all species of chlorarachniophyte? Please help clarify! Thanks!