Science

Cell theory

Period: Nov 24, 1550 to Nov 24, 1890

Zacharis Jansen

Nov 24, 1590

Zacharias Janssen contributed to the cell theory because he invented the Microscope.

Robert Hooke

Nov 24, 1663

Robert Hooke contributed to the Cell Theory because he discovered the cell.

Anton van leeuwenhoek

Nov 24, 1674

Anton Van Leeuwenhoek helped the cell theory because he messed with the microscope lenses to make them more clear.

Theodore Schwann

Nov 24, 1837

He helped with the cell theory because he discovered that all plants are composed of cells.

Matthias Schleiden

Nov 24, 1839

He helped the cell theory because he stated that "Different parts of the plants organisms are composed of cells."

Rudolph Virchow

Nov 24, 1855

He helped the cell thoery because he was the one who said that "All cells come from pre-existing cells."

Citations

Sep 21, 1889

Picture and info: "Matthias Schleiden (1804-1881)." Matthias Schleiden (1804-1881). N.p., n.d. Web. 21 Sept. 2015. Picture and info: "Rudolf Virchow." Wikipedia. Wikimedia Foundation, n.d. Web. 21 Sept. 2015. "Theodor Schwann Theorizes That All Living Things Are Made of Cells." Theodor Schwann Theorizes That All Living Things Are Made of Cells. N.p., n.d. Web. 21 Sept. 2015.

Modern cell theory

Sep 21, 1890

Modern cell theory-Statement 1-All living organisms are composed of one or more cells.Statement 2-The cell is the most basic unit of life.Statement 3-All cells arise from pre-existing, living cells, by biogenesis.