https://www.khanacademy.org/science/grade-11-biology-snc-aligned/x58c107ba92d3f0b2:domain-d-cells-and-sub-cellular-organelles/x58c107ba92d3f0b2:introduction-to-cells-and-cell-theory/v/cells-and-organisms-in 2025-07-09T07:43:38.684482642Z Cells and organisms Let's learn about cells and organisms Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Cells and organisms Let's learn about cells and organisms https://cdn.kastatic.org/ka-youtube-converted/nfjuW0feXvA.mp4/nfjuW0feXvA.mp4 235 Introduction to cells and cell theory https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:cells-and-organisms/x0c5bb03129646fd6:cells-organisms/e/understand-cells-and-organisms 2026-02-11T03:53:53.051913885Z Understand: cells and organisms Check your understanding of cells and organisms in this set of free practice questions. Khan Academy exercise https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:the-cellular-basis-of-life/e/apply-the-cellular-basis-of-life 2026-03-25T13:00:37.369559121Z Apply: the cellular basis of life Apply your understanding of the cellular basis of life in this set of free, standards-aligned practice questions. Megan Cohn exercise https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:the-cellular-basis-of-life/a/the-cellular-basis-of-life 2024-06-28T21:00:15.59562973Z The cellular basis of life Learn about what it means to be alive, and how cells are the foundational units of life. article 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 Introduction to cells and cell theory https://www.khanacademy.org/science/biology/structure-of-a-cell/introduction-to-cells/a/intro-to-cells 2021-04-29T07:48:39Z Intro to cells An introduction to cells, including the history of their discovery and the development of cell theory. article