https://www.khanacademy.org/science/biology/structure-of-a-cell/introduction-to-cells/v/cell-theory 2024-04-08T10:09:39.451522273Z Cell theory Hooke and Leeuwenhoek were two of the first scientists to use microscopes to study the microscopic world of cells. Hooke coined the term "cell" after observing the tiny compartments in cork, while Leeuwenhoek discovered a variety of living creatures in pond water, blood, and other samples. They contributed to cell theory, which states that 1) all living things are made of one or more cells, 2) cells are the basic unit of life, and 3) all cells come from other cells. Sal Khan video https://cdn.kastatic.org/googleusercontent/q-Xbn6mv7EiXt6WnXqIj5W6zj8y8l9-cXXi-FIa0fwGyZibGgNOElo8Zomjnb0VKQ5YvZEmT2OZNaXh46ghSVky7 Cell theory Hooke and Leeuwenhoek were two of the first scientists to use microscopes to study the microscopic world of cells. Hooke coined the term "cell" after observing the tiny compartments in cork, while Leeuwenhoek discovered a variety of living creatures in pond water, blood, and other samples. They contributed to cell theory, which states that 1) all living things are made of one or more cells, 2) cells are the basic unit of life, and 3) all cells come from other cells. https://cdn.kastatic.org/ka-youtube-converted/zk3vlhz1b6k.mp4/zk3vlhz1b6k.mp4 483 Cell Theory — The Unifying Principle of Biology https://www.khanacademy.org/science/strengthened-shs-biology-1/x12d91beacfa56326:cell-biology/x12d91beacfa56326:the-cell-parts-and-functions/e/cell-theory-questions 2026-04-08T00:36:09.500768563Z Cell theory questions Cell theory questions Garrick Trapp exercise