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There are many types of organelles, particularly in eukaryotic cells.While prokaryotes do not possess organelles per se, some do contain protein-based bacterial microcompartments, which are thought to act as primitive organelles.The larger organelles, such as the nucleus and vacuoles, are easily visible with the light microscope.

Other organelles are also suggested to have endosymbiotic origins, but do not contain their own DNA (notably the flagellum – see evolution of flagella).Mitochondria and chloroplasts, which have double-membranes and their own DNA, are believed to have originated from incompletely consumed or invading prokaryotic organisms, which were adopted as a part of the invaded cell.This idea is supported in the Endosymbiotic theory.Dating is a stage of romantic relationships in humans whereby two people meet socially with the aim of each assessing the other's suitability as a prospective partner in an intimate relationship or marriage.It is a form of courtship, consisting of social activities done by the couple, either alone or with others.

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