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Observed cork cells.
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He observed Cork Cells using the Microscope. Antoni van Leeuwenhoek helped support his theory by making the Microscpe a better piece of equitment.
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In 1678, Antoni van Leeuwenhook reported that he had observed "little animals" through a microscope. And Robert Hooke supported his theory.
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Schleiden was the first to recognize that all plants, and all the different parts of plants, are composed of cells. Theodor Schwann helped his theory.
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Theodor Schwann saw how plants and animals grow. Then lady published "Microscopic Investigations on the Accordance in the Structure and Growth of Plants and Animals," which said "All living things are made up of cells."
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Proposed that all living cells must rise from pre-existing cells.
And thanks to Louis Pasteur, they both concluded that this theory is true.
