Multicellular organisms are organisms with a large number of cells that perform many roles. Amoeba, Chlamydomonas, Paramecium, and Bacteria, for example, have solitary cells that make up the entire organism. Unicellular creatures have a single cell that performs all tasks such as nourishment, respiration, excretion, and reproduction. The discovery of the microscopic universe was made possible by the invention of magnifying lenses. In \, Rudolf Virchow advanced on the cell hypothesis by claiming that all cells originate from pre-existing cells. The cell theory, presented by Schleiden in \ and Schwann in \, states that all plants and animals are made up of cells. Purkinje created the name "protoplasm" for the cell's fluid portion in \. The nucleus of the cell was found by Robert Brown in \. With a better microscope, Leeuwenhoek observed free-living cells in pond water for the first time in \. Complex organisms' primary structural and functional unit is the cell.Ĭells were discovered for the first time in \ by Robert Hooke using a crude microscope. What are the Components of Living Organisms?Ĭells are the building blocks of all living beings.
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