Secondary endosymbiosis can occur when a

A) nonphotosynthetic protist engulfs a photosynthetic bacterium.
B) virus infects a photosynthetic prokaryote.
C) protist evolves to become a prokaryote.
D) nonphotosynthetic protist engulfs a photosynthetic protist.
E) green alga engulfs a photosynthetic bacterium.


D

Biology & Microbiology

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