context: Euglenophytes are a group of common flagellated protists that contain chloroplasts derived from a green alga. Euglenophyte chloroplasts have three membranes—it is thought that the membrane of the primary endosymbiont was lost, leaving the cyanobacterial membranes, and the secondary host's phagosomal membrane. Euglenophyte chloroplasts have a pyrenoid and thylakoids stacked in groups of three. Starch is stored in the form of paramylon, which is contained in membrane-bound granules in the cytoplasm of the euglenophyte.
question: యూగ్లెనోఫైట్ క్లోరోప్లాస్ట్లలో ఏ పొర కోల్పోయింది?
answers: the membrane of the primary endosymbiont the primary endosymbiont primary endosymbiont