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:
... average density of 1,640.9/km² (4,169.6/mi²). The racial makeup of the village is 98.55% White, 0.00% African American, 0.00% Native American, 1.45% Asian, 0.00% ...