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Zacharias Jansenn invented the compound microscope in 1595. Robert Hooke used this to discover cells.

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In 1665 Robert Hooke discovered cells.  He called them this because they looked like the small rooms monks lived in called cells. Without him, cell theory could not exist.

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In 1673 Anton van leeuwenhoek invented microscope lenses.  In 1720 he discovered protistic bacteria. Without his lenses people couldn't discover smaller things.

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In 1838 scientist Matthias Schleiden analyzed plants and plant cells through a compound microscope. He discovered the fact that cells are in plants.

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In 1839, just a year after Schleiden's research, Schwann and Schleiden researched together. Matthias Schleiden's research was about plants and showed that plants have cells.  Although, Schwann was interested and curious as to whether this would be the case with animals.  The research proved that all things have cells. He helped discover the fact that all living things are made of cells.

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1. Cells are the smallest unit of life
2. Cells make up all living things
3. Cells come from preexisting cells