Presence of a double membrane surrounding the endosymbiont


Which of the following is true of secondary endosymbiosis? It is indicated by the presence of a double membrane surrounding the endosymbiont.
An organism containing one endosymbiont engulfs another organism, and that organism becomes an endosymbiont.
It is indicated by the presence of a nucleomorph.
An organism containing an endosymbiont is engulfed by another organism and becomes an endosymbiont.
It is indicated by the presence of a mixotroph. 

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Biology: Presence of a double membrane surrounding the endosymbiont
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