-
This man did many experiments. He says that each gene has a definite parent and a similar offspring. source (https://embryo.asu.edu/pages/aristotle-384-322-bce#:~:text=In%20natural%20philosophy%2C%20later%20called,undifferentiated%20material%2C%20later%20called%20epigenesis.)
-
Believed to be the first to invent the compound microscope with his father. They found if you put a lens at the top and bottom of a tube, the object you look at will become magnified. This helped lead to rejection to spontaneous generation. source (https://en.wikipedia.org/wiki/Zacharias_Janssen)
-
He supported the idea of spontaneous generation. He tried to create a home recipe for creating mice.
He discovered the process of photosynthesis as well. sources (https://www.famousscientists.org/jan-baptist-von-helmont/) -
First person to observe cells
Coined the term "cell" while observing a piece of cork.
Cells came from the term cell which is a monk's living quarters.
His discoveries led to greater understanding of cells and life. source (https://www.britannica.com/video/213697/Overview-scientist-Robert-Hooke-cell-theory) -
He invented a lens that could magnify 270% more. He also was the first person to see spermatozoa and protozoa.
His finding support cell theory as a whole. source (http://www.bbc.co.uk/history/historic_figures/van_leeuwenhoek_antonie.shtml) -
He figured that all living things are made of cells and originate from cells. source (https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/lorenz-oken)
-
He observed plant cells and discovered + named the nucleus. The man stressed its importance in reproduction and recognized its significance as an essential organelle. source (https://biography.yourdictionary.com/robert-brown)
-
He observed plants on a microscopic level
All plant tissues are composed of cells embryonic plants arise from single cells.
He stated that cells are the building blocks of plant matter.
All plants grew through the production of new cells.
He believed that new cells in plants were formed from the nucleus of the old cell. sources (https://embryo.asu.edu/pages/matthias-jacob-schleiden-1804-1881) -
He proposed the cell theory (and coined the term), according to which all plant and animal tissues are composed of cells, and within an individual organism all the cells are identical 1839
He also worked fermentation and discovered the enzyme pepsin
He rejected spontaneous generation source (https://www.encyclopedia.com/people/science-and-technology/cell-biology-biographies/theodor-schwann) -
He discovered through the help of powerful microscopes that the sperm and egg were composed of cells and that humans are formed of cells from beginning to end. source (https://www.sutori.com/item/untitled-d27b-e6b4)
-
He believed Every cell stem forms another cell.
He was the first to demonstrate that the cell theory applies to both normal and diseased cells.
This added to the cell theory and strengthened the theory that cells exist from pre-existing cells. source (https://study.com/academy/lesson/rudolf-virchow-discovery-cell-theory-contributions.html) -
Proved the cell theory by showing that spontaneous generation does not exist and all cells are formed by pre-existing cells. sources (https://en.wikipedia.org/wiki/Louis_Pasteur)
