Two biologist s, Schleiden (1838) and Schwan n ( 1839) , formulated t he cell theory. This theory states that all plants and animals are composed of cells and that the cell is basic unit of life. Anonymous Can we omit 'the' from 'the cell'.
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AnonymousCan we omit 'the' from 'the cell'.No, And what in the world does perpendicularity have to do with it?!