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1) All living things are made of one or more cells
2) Cells are the basic unit of structure and function in all organisms
3) All cells come from previously existing cells

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In 1665, he described cells by examining a piece of cork under a compound microscope. He invented it and it was able to magnify thirty times. He discovered small animals like Protozoa and bacteria, and saw a honeycomb formation which he called cells. He paid attention to the cell walls and noticed they stay together even when a cell dies.

Hooke contributed to the first and second parts of the cell theory because he was the first to see how living things and even dead living things such as a piece of cork had been made of multiple cells. He saw the cell walls that were maintained even through death and their structure as well as function within the organism

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In 1668 Francesco Redi held an experiment and disproved spontaneous generation by observing that maggots in dead meat came from fly eggs rather than fly eggs.

This relates to the third part of the theory of cell evolution. His experiment proved that cells have to come from more cells rather than from instantly being generated (spontaneous generation) as the maggots are found to come from fly eggs in the dead meat.

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Dutch Microscopist

Learned to grind lenses and assemble them into simple microscopes, and he used this to observe the cells.

1676 - published his observations of single-cell organisms, or "little animalcules"

First person to observe a red blood cell and a sperm cell.

Made numerous and detailed observations on his microorganisms

One hundred years passed before a connection was made between the obviously cellular structure of these creatures and the existence of cells in animals or plants.

Contributed to the first part of the cell theory

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Dealt with animal classification and evolution.

Helped the work of Schleiden & Schwann in cell theory.

Contributed to the first and second parts of the cell theory .

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"Every step which Nature takes when making her direct creations consists in organizing into cellular tissue the minute masses of viscous or mucous substances that she finds at her disposal under favorable circumstances." - Humans are made through viscous and mucous substances organized by cellular tissue

“No body can have life if its constituent parts are not cellular tissue or are not formed by cellular tissue.”  - Life cannot exist if it is not made up of cells and tissue.

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Matthias Schleiden and Theodore Schwann (1838)

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Matthias Schleiden and Theodore Schwann (1838)

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Schleiden studied plant cells and Schwann studied animal cells. They compared plant and animal cells, and noticed many similarities

Schleiden studied plant cells under a microscope and determined that they are the basic unit of plant life. Schwann studied animal cells and determined that they are the basic unit of animal life

They concluded that cells are the basic unit of life

They discovered that plants and animals are made of 1 or more cells

Contributed to the first and second parts of the cell theory

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Contributed to the third part of the cell theory

Created the famous quote, “omnis cellula e cellula“ (translates to “every cell stems from another cell“)

Virchow had helped with his quote to develop new information in fields of disease as well as the concept that all cells come from other life. Life has to be produced from other life and organisms and cannot be created from nothing. All life comes from other life and Virchow helped with the third part of the cell theory.

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Louis Pasteur helped create the third part of the cell theory and solidified the cell theory

He helped disprove spontaneous generation using an experiment

The experiment consisted of boiled meat broth in a flask with a neck that curved downward, meaning outside particles could not enter the broth. There were no growths until the flask was broken. This disproved spontaneous generation by showing that the organisms came from the outside and did not appear from the broth itself.

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They were students when they assembled a model of a microscope that could magnify 7000 times the size of an object. They contributed to the second part of the cell theory because they invented a microscope that can view cells structures and functions even further, offering  a better view of the cells and their structures.

They invented the electron microscope

The electron microscope allowed even greater view of cells, 2000 times more than previous microscopes and provided a closer look at cells

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https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2603088/

http://homework.uoregon.edu/pub/class/301/evolution.html

http://staffsites.slcschools.org/jsnow/Labs/CellStructureLab/Cell%20Theory.html

https://www.nationalgeographic.org/encyclopedia/cell-theory/

https://lemelson.mit.edu/resources/james-hillier

https://www.sciencephoto.com/media/229069/view/rudolf-virchow-german-pathologist

http://www.virtualmuseum.ca/edu/ViewLoitDa.do;jsessionid=BE7CF03827B6BB1F8B90B910D7AC4CF3?method=preview&lang=EN&id=3982

https://www.britannica.com/biography/Matthias-Jakob-Schleiden

https://www.britannica.com/science/cell-biology/The-development-of-metabolism#ref313881

https://www.sciencehistory.org/historical-profile/louis-pasteur

https://bio.libretexts.org/Bookshelves/Microbiology/Book%3A_Microbiology_(Boundless)/1%3A_Introduction_to_Microbiology/1.1%3A_Introduction_to_Microbiology/1.1C%3A_Pasteur_and_Spontaneous_Generation#:~:text=Louis%20Pasteur's%201859%20experi++ment%20is,curved%20downward%2C%20like%20a%20goose.&text=This%20was%20one%20of%20the,the%20theory%20of%20spontaneous%20generation.

https://www.britannica.com/biography/Francesco-Redi

https://www.google.com/searchq=anton+van+leeuwenhoek+cell+theory&safe=strict&rlz=1C1GKLO_enUS841US841&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiEyK-CrdXsAhVNTd8KHbaZCqoQ_AUoAXoECA8QAw&biw=800&bih=756#imgrc=kgHL9GS4e-tHpM

https://amoebamike.wordpress.com/2009/10/06/spontaneous-generation-a-brief-history-of-disproving-it/

https://www.scientus.org/Redi-Galileo.html

https://www.proprofs.com/quiz-school/story.php?title=cells-basic-units-life-quiz

https://www.aaas.org/rudolph-virchow-father-cellular-pathology