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A father/son duo who created the first compound microscope. This helps view cells and organisms more easily.

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Robert Hooke saw something in the cell walls of cork tissues. This caused him to discover cells. Also, Hooke discovered similar structures in wood and in some plants.

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He reported that he had observed "little animals" protozoa through a microscope.

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He discovered that all plant tissues are made of cells and that an embryonic plant arose from a single cell.He said that the cell is the basic building block of all plant matter.

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Theodor Schwann Discovered the basic unit of life was the cell. This layer part of the ground work for the cell.

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Concluded animal tissues were made of other cells which was the 3rd part of the cell theory and was put forth in 1855. He also concluded that cells arise from cells