The apparent displacement, or difference of position, of an object, as seen from two different stations, or points of view. In contemporary writing parallax can also be the same story, or a similar story from approximately the same time line, from one book told from a different perspective in another book.
In 1838, Theodor Schwann and Matthias Schleiden were enjoying after-dinner coffee and talking about their studies on cells. It has been suggested that when Schwann heard Schleiden describe plant cells with nuclei, he was struck by the similarity of these plant cells to cells he had observed in animal tissues.
Animal tissues are of four basic types: Epithelial, Connective, Muscular and Neural tissues. Multiple tissues compose organs and body structures. Generally animals are said to made up of these basic four type of tissues, but the presence of these tissues may differ, depending on the type of organism.