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  1. The theory which states that all animals and plants are composed of cells and cell products is known as

    2. A.

     Cell Theory
    B.

     Atomic Theory
    C.

     Bohr's Theory
    D.

     None of the above

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    Answer : Option A

    Explanation :

    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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