Hi, I am Yujiro and this is our classroom. Today, we'll be learning about how The Cell Theory came to be. Let's go!
These are my teacher and classmates. They will be with us as we learn about The Cell Theory.
Yeah! Today, we'll be looking on some people behind this theory.
So first, let's talk about what The Cell Theory tells us: 1.) All organisms are composed of one or more cells, 2.) The cell is the basic unit of life, and 3.) Cells arise from pre-existing cells. Now, with the help of your classmates, let's go through the people behind this theory.
Hi! In 1590, a guy named Zacharias Janssen invented the first microscope. Because of his invention, a lot of curious people, like Robert Hooke, wanted to use it to examine things. In 1665, Hooke looked at a cork and saw tiny chambers inside them and coined them with the term 'cell'.
Then, in 1673, Anton van Leeuwenhoek was the first to see living microscopic organisms and called them 'animalcules'. Fast forward to 1838-1839, Matthias Schleiden and Theodore Schwann concluded that "all living plants are made up of cells" and "all living animals are made up of cells" respectively.
And finally, in 1855, Richard Virchow concluded that "where a cell exists, there must have been a pre-existing cell."
And that's how The Cell Theory came to be, thanks to all these people! Thank you for coming too! 'Till next time!