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Q1. They Provided evidence for the cell theory.

Q2.The instrument that was necessary for Cell Theory to be developed is the microscope.

Q3.The three scientists that directly contributed evidence for the cell theory was Theodor Schwann, Matthias Jakob Schleiden, and Rudolf Virchow.

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He is cited as the first to recognize leukemia cells. He was one of the first to accept and plagiarize the work of Robert Remake who showed that the origins of cells was the division of preexisting cells.

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Theodor Schwann became the first to formulate what was then an informal belief as a principle of biology equal in importance to the atomic theory of chemistry. He also recognized the importance of the cell nucleus.

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In 1665 Hooke published Micrographia, a book describing his microscopic and telescopic observations, and some original work in biology. Hooke coined the term cell for describing biological organisms, the term being suggested by the resemblance of plant cells to monks' cells.

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Matthias Jakob Schleiden created what is called the cell theory. The cell theory states that all living things are made up of one or more cells.

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He discovered the first protozoa and bacteria discovered

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Anton Van Leeuwenhoek*1670 A Dutch biologist, looks at pond water with a microscope he made lenses for 

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Anton Van Leeuwenhoek*1670 A Dutch biologist, looks at pond water with a microscope he made lenses for 

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Hans and Zacharias Janssen were the inventors of the first compound microscope.

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Discovered a honey-comb like structure in a cork slice using a primitive compound microscope. he only saw cells walls as this was dead tissue. he coined the term cell for these individual compartments he saw