The given question is incomplete, the complete question is:
The cell theory was first proposed in 1838. Evidence obtained through additional scientific investigations resulted in the current cell theory. Which statement describes a component of the original cell theory that was removed because of the new scientific knowledge?. . A. All living things are made of cells.. . B. All cells come from other preexisting cells.. . C. Cells are the basic structural and functional units of life.. . D. Cells form through spontaneous generation.
Answer:
The correct answer is option D, that is, cell produce through the spontaneous generation.
Explanation:
Louis Pasteur and Rudolf Virchow gave modern cell theory. However, before the modern cell theory, it was considered that origination of life began through spontaneous generation. Based on spontaneous generation all the origination of all the forms of life took place from non-living components.
Based on spontaneous generation theory, it was considered that formation of fleas took place from dust, and rotten meat gave rise to maggots, it was also believed that bread and wheat left in the dark corner gave rise to mice. However, with the emergence of modern cell theory, the theory of spontaneous generation was neglected.