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he contributed the compound optical microscope. /prezi.com.  he made his contribution in 1590

/www.britannica.com

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Leeuwenhoek contributed to the cell theory unicellular bacteria in 1674. His contribution to cell theory was the word "cell" and his discovery of cells in a piece of cork.

https://cs.swan.ac.uk

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Theodor made his discovery in 1836. Through working with animal tissue  he came up with cell reproducing by other cellls.
https://www.britannica.com/biography/Theodor-Schwann

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Matthias was a German botanist. He made his discovery in 1838.  He is discovered that cells were a fundamental unit of plant. He also came up with cytoplasm but did not come up with the theory of the cell splitting.
https://www.lindahall.org/matthias-schleiden/

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He contributed to cell theory by disproving the theory of cells just spontaneous. He proved this by leaving cell in a container and realized they would only grow if exposed to air. He made the discovery in 1850 then went on through his career proving the point with things like food going bad with the spreading of bacteria.
https://lisbdnet.com/
https://ourstory.jnj.com/louis-pasteur-discovers-germ-theory

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The eminent pathologist Rudolf came up with the idea that every cell is from another cell. This happened in 1855.

Rudolf Virchow - NCBI
https://www.ncbi.nlm.nih.gov › articles › PMC2603088

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The invention of the microscope led to the discovery of the cell by Hooke. Initially discovered by Robert Hooke in 1665, https://www.nationalgeographic.org

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1. How did Janssen's, Hooke's, and Leewenhoek's work contribute to the work of the scientists that came after them?

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1. How did Janssen's, Hooke's, and Leewenhoek's work contribute to the work of the scientists that came after them?

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Leewenhoek discovered the cell then the people after them came up with rules for the cells.

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2. How would our lives be different if we had never realized the existence of microorganisms? Provide at least one example to support your answer. 

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2. How would our lives be different if we had never realized the existence of microorganisms? Provide at least one example to support your answer. 

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Our lives would be different because if we were to comment crimes then we would not be able to collect DNA from a crime seen and a lot of innocent people would go to jail.

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3. Describe the concept of spontaneous generation. Why do you think it took such a long time for people to accept that this idea was incorrect?

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3. Describe the concept of spontaneous generation. Why do you think it took such a long time for people to accept that this idea was incorrect?

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Spontaneous generation is when cells just multiples randomly from non-living thing. This makes sense because that is how it looks from the outside. We can not see the invention of the microscope the cell splitting. It would take multiple experience done on the microscopic level to prove this theory.

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4. How do you think the cell theory impacted later scientific discoveries? Explain your answer. 

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4. How do you think the cell theory impacted later scientific discoveries? Explain your answer. 

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Knowing the rules of how this unit of life works puts down a foundation so we can disprove ideas. Know that we know that cells separates we can learn more bout how babys are formed from just a sperm and a egg and them separate from a zygote.

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5. The microscope and numerous experiments lead to the rejection of spontaneous generation. This idea had been accepted by most people, including scientists, for over 200 years. How does this demonstrate the true nature of science?

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5. The microscope and numerous experiments lead to the rejection of spontaneous generation. This idea had been accepted by most people, including scientists, for over 200 years. How does this demonstrate the true nature of science?

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Science is always changing. Theory are just an idea supported by scientific evidence. This means that if another valid experiment changes it then it is open for edits.