Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell.
Discuss the main steps in the digestion of proteins as the food passes through different parts of the alimentary canal.
Describe the important steps in muscle contraction.
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