do sieve cells arrise from pre-existing cells
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All cells arise from pre- existing cells if we consider RBC and Sieve tubes.
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Theodor Schwann
By the late 1830s, botanist Matthias Schleiden and zoologist Theodor Schwann were studying tissues and proposed the unified cell theory. The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.
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