"in the three-domain model the bacterial ancestor of mitochondria derives from ancient"

Question is incomplete.

the full question is  as follow

In the three-domain model, the bacterial ancestor of mitochondria derives from ancient , where as chloroplasts derive from ancient .

Explanation:

A review article is published in journal of cell science in 2016, in which they reveled the bacterial hierarchy how bacteria came into existence.  According to this paper and its references In the three-domain model, the bacterial ancestor of mitochondria derives from ancient ___proteobacteria___, where as chloroplasts derive from ancient ___cyanobacteria___.

Reference: Dacks, Joel B., et al. "The changing view of eukaryogenesis–fossils, cells, lineages and how they all come together." J Cell Sci 129.20 (2016): 3695-3703.

answer///alimentary canal/gastrointestinal tract.digestive (gi);

the correcdt answer shoukld be a