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What was anton van leeuwenhoek's contribution in the development of cell theory? a. he built the first compound microscope. b. he was the first to observe live cells in a sample of pond water. c. he concluded that cells exist in liquids. d. he stated that all living things are made of cells. a. he built the first compound microscope. b. he was the first to observe live cells in a sample of pond water. c. he concluded that cells exist in liquids. d. he stated that all living things are made of cells.
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