In biology, particularly cell biology, the term organelle is used to describe any one of a number of types of subcellular structures, historically identified through the use of some form of microscopy.
A few large organelles probably originated from endosymbiont bacteria:
... themselves. Quackery doesn't have to deal with their wrongs of the past, they don't call themselves quacks, they can change their name to whatever is trendy at the time, ...