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:
... income of $51,172 versus $32,500 for females. The per capita income for the town is $28,378. 13.9% of the population and 7.7% of families are below the poverty line. ...