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Zacharias Janssen invented the first microscope (in the year 1590) to see things like things in the water but this man did not make any discoveries with the invention. He contributed to "The Cell Theory" by making the invention easier to look at the cells.

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robert hooke in the year 1665

bought a microscope and started observing things like a piece of food or a piece of cork and while he was looking at it he saw little boxes that reminded him of cells like the jail cells that show how we got the term cells. He contributed to the cell theory by watching a stopper through his magnifying lens, Hooke saw little boxlike cavities, which he outlined and depicted as cells. He had found plant cells! Hooke's achievement drove the understanding of cells as the littlest units of life—the establishment of cell hypothesis; he also wrote an article called Micrographia on his discovery.

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Antonie van Leeuwenhoek in the year 1668 to 1683 created another microscope he heard about Zacharias Janssen invention but instead of buying it he made one and used it to look at and was the first person to discover bacteria (his teeth gunk) this contributed to the cell theory From examining and testing with his magnifying lens, Leeuwenhoek got to be one of the primary researchers to allude to living cells when he watched an inexhaustible number of single-celled living beings, which he called animalcules (plant & creature), swimming in a drop of lake water! In simple words (discovering and describing bacteria and creating a science paper about bacteria without him we would not know about bacteria) After Antonie van Leeuwenhoek he sent his research about bacteria to robert hooke

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In 1833 Robert Brown discovered the nucleus in the plant cell and contributed to the cell theory by helping prove the cell theory.

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In the 1838 the scientist called Matthias Jakob Schleiden created the first part of the cell theory well ⅓ of part of cell theory he just said all plants are made of cells

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Matthias Schleiden and  Theodor Schwann 1838 to 1839

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Matthias Schleiden and  Theodor Schwann 1838 to 1839

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By the late 1830s, botanist Matthias Schleiden and zoologist Theodor Schwann were examining tissues and proposed the bound together cell hypothesis. The bound together cell hypothesis states that: all living things are composed of one or more cells; the cell is the essential unit of life, and unused cells emerge from existing cells.

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In 1839 the scientist called Theodor Schwann created the other ⅔ of the part of cell theory he said all plants and animals are made of cells that started a brawl between matthias and Theodor but at the end the conclusion was that plants and animals also had different structures but all has cells.

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In 1840 a swiss anatomist Albrecht von Koelliker discovered that sperm and egg are cells.

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Carl Heinrich Braun in 1845 changed the cell hypothesis characterizing cells as the essential unit of life. ... He proposed that all cells come from existing cells. He moreover was the primary to propose that ailing cells come from sound cells but he was not the first person to propose that all cells come from pre-existing cells but

it was theodor schwann who proposed it first.

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In 1855 Rudolf Virchow made the theory that all cells came from existing cells. But it was Carl Heinrich Braun and Theodor Schwann who first proposed the idea but It was Rudolf Virchow who wrote a whole book about it, proving it and mainly putting it into cell theory Carl Heinrich Braun and Theodor Schwann just made a hypothesis.

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Louis Pasteur found that microorganisms cause maturation and malady, spearheaded the consider of atomic asymmetry, made the method of pasteurization, and created antibodies against Bacillus anthracis and rabies.

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In 1931 Janet Plowe proved that the cell membrane is a real form.

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1931 to 1960. The development of the electron magnifying instrument by Max Meadow and Ernst Ruska at the Berlin Technische Hochschule in 1931, at last, overcame the boundary to a higher determination that had been forced by the impediments of obvious light.

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Margulis in 1970 proposes that organelles were once free-living animals on their own.

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animals on their own.

In the year 2019 Scientists at the College of Virginia School of Medication have found a bizarre unused organelle interior of our cells that makes a difference to avoid cancer by guaranteeing that hereditary fabric is sorted accurately as cells