In the 1830s, two scientists named Matthias Schleiden and Theodor Schwann stated a theory we now call the cell theory. Which of these statements is part of the cell theory?
a
All cells look the same.
b
Cells sometimes arise by spontaneous generation.
c
The life-sustaining activities of an organism do not take place in the cells of the organism.
d
All cells come from other cells.
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