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B
Hugo Von Mohl
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C
Fontana
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D
F. Meischer
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Solution
The correct option is A Dujardin
Leeuwenhoek was the first to see free living cells. He observed bacteria, protozoa, red blood cells, sperms etc. under his microscope. In 1809, Lamarck concluded that all living beings are formed of cells. Living substance was first observed by Corti in 1772 and was named sarcode by Dujardin in 1835.