[Old_Mil]

The endosymbiotic hypothesis says that prokaryotes lived symbiotically within the ancestor of single-celled eukaryotes.

Untrue. The endosymbiotic hypothesis as it applies to evolution is an attempt to explain the origin of eukaryotic cells through prokaryote-prokaryote endocytosis, symbiosis, and organelle formation. If you know anything about biology, you know that. You also know that your link does absolutely nothing as far as proving such an origin.

[Right Wing Professor]

The endosymbiotic hypothesis says that prokaryotes lived symbiotically within the ancestor of single-celled eukaryotes.

UntrueThe endosymbiotic hypothesis as it applies to evolution is an attempt to explain the origin of eukaryotic cells through prokaryote-prokaryote endocytosis, symbiosis, and organelle formation

BWAHAHAHA! So what was the ancestor of a eukaryotic cell before it incorporated organelles? Was it a eukaryote?

You also know that your link does absolutely nothing as far as proving such an origin.

Attempted disproof by repeated denial. We know that living prokaryotes invade other prokaryotic cells endoparasitically. We know they invade single celled eukaryotes endsymbiotically, and that they replace mitochondia in some protozoans. If an endosymbiotic prokaryote can and does replace the role of a mitochondrion, that doesn't suggest that the mitochondrion might have evolved from a prior endosymbiotic prokaryote?