https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:cells-and-organisms/x0c5bb03129646fd6:cells-organisms/v/ms-cells-and-organisms 2022-09-10T03:04:58.582913383Z Cells and organisms All living things are made up of cells, which is the smallest unit that can be said to be alive. An organism may consist of one single cell (unicellular) or many different numbers and types of cells (multicellular). Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/4c87c6c9-4669-4319-91b7-935603e64401_1280_720_base.png Cells and organisms All living things are made up of cells, which is the smallest unit that can be said to be alive. An organism may consist of one single cell (unicellular) or many different numbers and types of cells (multicellular). https://cdn.kastatic.org/ka-youtube-converted/Uiqro5TUyLA.mp4/Uiqro5TUyLA.mp4 237 Cell theory https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:cells-and-organisms/x0c5bb03129646fd6:cells-organisms/a/cells-and-organisms 2026-04-15T10:00:48.515869037Z Key points: Cells and organisms Review your understanding of cells and organisms in this free article. article https://www.khanacademy.org/science/grade-6-science-tx/x6eddf2e1c524bf5a:cells-and-organisms/x6eddf2e1c524bf5a:cell-theory/a/cell-theory 2026-06-30T17:20:49.845080165Z Learn and try: Cell theory Learn about what it means to be alive, and how cells are the foundational units of life. article https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:cells-and-organisms/x0c5bb03129646fd6:cells-organisms/e/understand-cells-and-organisms 2026-06-30T17:20:49.845080165Z Understand: Cells and organisms Check your understanding of cells and organisms in this set of free, standards-aligned practice questions. Khan Academy exercise https://www.khanacademy.org/science/grade-6-science-tx/x6eddf2e1c524bf5a:cells-and-organisms/x6eddf2e1c524bf5a:cell-theory/e/apply-cell-theory 2026-06-30T17:20:49.845080165Z Apply: Cell theory Apply your understanding of cell theory in this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise