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A Cell is the smallest unit that can live on it's own and that makes up all living organisms and the tissues of the body.
A Cell has three important parts:

-Cell membrane
-Nucleus
-Cytoplasm

The cell membrane sorrounds the cell and controls the substances that go into and out of the cell.

Source: https//www.cancer.gov

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There are 2 types of Cells, Eukaryote and Prokaryote.
The prokaryote has a nucleoid and the eukaryote has a nucleus

Who discovered eukaryote and Prokaryote cells? Antonio van Leeuwenhoek. He watched through the microscope protozoos and sperm (Eukaryote) and Prokaryote cells (Bacteria)

Source: https://flexbooks.ck12.org/cbook/ck-12-middle-school-life-science-2.0/section/2.4/primary/lesson/prokaryotic-and-eukaryotic-cells-ms-ls/

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Matthias schleiden: discovered plant cells.
Theodor schwann: discovered animal cells.
Rudolph virchow: discovered cells reproducing.

Source: science book 8 grade sm page 87

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Hooke observed a cork branch with a microscope and he discovered the cell walls.

This discovery was VERY Important because it marked the beginning of the study of the cells with the microscope. After that discovery many scientists began to see different things through the microscope.

Source: Science class

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At the start, the Greeks used glass with water to use it like a magnifying glass to see small things.

Until today it is not know who created the microscrope, it is believed that they are: Zacharias Jansen or Galileo Galilei.

Years later in 1665, the astronomer and physicist Robert Hooke, Observed microscopic things and wrote the work “Micrographia”, with the microscope he
observed common things like: Hair, Insects, Pins, Textiles, etc.

Source: science book 8 grade sm page 82

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What is a microscope for and why it's so useful?

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What is a microscope for and why it's so useful?

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A microscope is an optical instrument that is used to enlarge the image of objects or living beings, so small that they cannot be seen with the naked eye, it uses high magnification lenses.

The microscope is used to study really small things like cells or bacteria, thanks to the microscope it’s been possible to study cells. Before the microscope they didn't know that everything is made of cells.

Source: https://cientecinstrumentos.cl/que-es-un-microscopio-optico/#:~:text=El principio de funcionamiento de,a partir de distintas lentes.

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In summary, thanks to all scientists and biologists who throughhout history have discovered cells, types of cells and their characteristics, we can now know that absolutely everything, including our body, is made of Cells.