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:
... town is 98.12% White, 0.00% African American, 0.06% Native American, 0.58% Asian, 0.00% Pacific Islander, 0.26% from other races, and 0.97% from two or more races. 1.88% ...