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B
A zoologist.
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C
Both a botanist and a zoologist.
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D
A psychlologist.
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Solution
The correct option is C Both a botanist and a zoologist. All animals and plants are composed of cells,which serve as the units of structure and function and all cell arise from pre-existing cells. This is called the Cell Theory. It was propounded by Matthias Schleiden a German botanist ,and Theodor Schwann a zoologist in 1839 later on Rudolf Virchow added to this in 1858.