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Patterns in Nature

1. Organisms are made of cells that have similar structural characteristics OUTLINE THE HISTORICAL DEVELOPMEMT OF THE CELL THEORY, IN PARTICULAR, THE CONTRIBUTIONS OF ROBERT HOOKE AND ROBERT BROWN In 1665 Robert Hooke observed cork cells using a compound microscope and described ‘little boxes or cells distinct from one another’ In 1831 Robert Brown observed the nucleus in plant and animal cells The Cell Theory; Cells are the smallest units of life (Schwann, Schleiden – 1839) All living things are made up of cells (Schwann, Schleiden – 1839) All cells come from pre-existing cells (Rudolf Virchow – 1839)

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