It still blows my mind that mitochondria were once prokaryotic cells that were swallowed up, harnessed for energy, duplicated and then slowly streamlined as more and more of their native functions were transferred to the host eukaryotic cell. Biology perfected the art of M&A before primates in suits ever walked the planet
@SilencingTrees For about forty years it has been. In 1982, it was contentious enough for reviews of the literature to be relatively even-handed. In 1992, most of the field agreed it was likely to be true. Most of the current discussion is centered on specific mechanisms by which it happened and when.