Составить из нижеперечисленных слов предложения. 1.by the 19th century/more/Improvements/allowed/in microscopes/detailed investigations/.
2.two German scientists, Matthias J. Schleiden and Theodor Schwann/inde-
pendently/that/In the 1830s/called the cell theory/ Scottish botanist Robert Brown/concluded/the cell nucleus/that/discovered/and/the basis of all life/ were/cells/a view/called/.
3.in 1858/that/Rudolf Virchow/from/another German scientist/all cells/previously/existing cells/develop/stated/.
4.to preserve cells/opened/for intensive research/During the late 19th century/ techniques/the way/ of fi xing and staining tissues/.