Answer:
(b) In 1938 Schleiden proposed the idea that plants consist of
cells. Later in the year 1839, Schwann independently asserted that all animals
and plants are made up of cells. This joint finding forms the basis of cell
theory.
The cell theory was refined further in 1855, when R,
Virchow presented the idea that all cells arise from pre-existing cell. His amorphism
was (Omnis Cellula-e-Cellula).
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