1) Canadians who developed the first practical electron microscope a) Hooke b) Schleiden and Schwann c) Hillier and Prebus d) van Leeuwenhoek e) Virchow 2) invented one of the first microscopes a) van Leeuwenhoek b) Virchow c) Hooke d) Schleiden and Schwann e) Hillier and Prebus 3) made the hypothesis that all organisms are composed of cells a) van Leeuwenhoek b) Virchow c) Hooke d) Hillier and Prebus e) Schleiden and Schwann 4) first to observe cells a) van Leeuwenhoek b) Virchow c) Hooke d) Schleiden and Schwann e) Hillier and Prebus 5) combined his ideas to those of other German scientists to formulate a set of hypotheses called the cell theory a) van Leeuwenhoek b) Schleiden and Schwann c) Virchow d) Hooke e) Hillier and Prebus

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