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:
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Jean François La Pérouse, (1741-1788), French explorer of the Pacific
Meriwether Lewis, (1774-1809), leader of the first American expedition to cross the ...