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1. All living things are made up of one or more cells

2. All cells come from pre-existing cells (other cells)

3. The cell is the basic unit of structure and function for all living things.

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This scientist helped develop the idea and create the first compound microscope. People argue this though, because of other people who had done something similar to that at the time.

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Hooke was in contact with Leeuwenhoek. Hooke enjoyed a lot of science things, including physics and biology. He was looking at a piece of cork, and he saw the cells- and believed they looked like cells- like building cells. So then he named/called them cells.

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When Janssen began selling the compound microscope, Leeuwenhoek went to make his own. It looked more like a paddle than a microscope. He then found bacteria- and named the cells animalcules, due to their animal like shape.

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He studied plants, and realized that all plants were made of cells.

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He studied slides of animal cells, and made rebreathers for firefighters. He realized that all animals were made of cells. After reaching out to other scientists, Schlieden was one that began to work with Schwann.

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He supplied research that showed that cells come from other cells. Stolen research, but proof nonetheless.