You, as a cell biologist, discover that there is strong evidence that chloroplasts, found in plant and algal cells, are descended from bacteria but not eukaryotes. What theory would explain this finding?

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The endosymbiont theory proposes that chloroplasts and mitochondria were once free-living bacteria that were engulfed by a primitive eukaryotic cell and eventually became a permanent part of the cell. This theory explains the finding that chloroplasts, which are organelles in plant and algal cells, are descended from bacteria but not eukaryotes.

You, as a Cell Biologist, Discover That There Is Strong