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:
... an average density of 789.1/km² (2,045.6/mi²). The racial makeup of the town is 88.27% White, 3.90% African American, 0.20% Native American, 2.13% Asian, 0.05% ...