Assertion: chloroplast | /r/HasProperty | free living bacteria
Facets:
value: according to the endosymbiont theory
type: OTHER
Source sentences:
text: There is evidence that chloroplasts were once free living bacteria that invaded a non-photosynthetic cell long ago.
text: According to the endosymbiont theory, mitochondria and chloroplasts were once free-living organisms that were each taken up by a eukaryotic cell.